Having a key switch Shift Lock for the camera?

I tried modifying the RootCamera script, but this doesn't work. What should I do? (lines modified/added: 7, 200-210)

local PlayersService = game:GetService('Players')
local UserInputService = game:GetService('UserInputService')
local StarterGui = game:GetService('StarterGui')
local GuiService = game:GetService('GuiService')
local ContextActionService = game:GetService('ContextActionService')
local VRService = game:GetService("VRService")
local UserInputService = game:GetService("UserInputService")

local LocalPlayer = PlayersService.LocalPlayer
local PlayerGui = nil
if LocalPlayer then
	PlayerGui = PlayersService.LocalPlayer:WaitForChild("PlayerGui")
end

local PortraitMode = false

local CameraScript = script.Parent
local ShiftLockController = require(CameraScript:WaitForChild('ShiftLockController'))

local Settings = UserSettings()
local GameSettings = Settings.GameSettings

local function clamp(low, high, num)
	return (num > high and high or num < low and low or num)
end

local math_atan2 = math.atan2
local function findAngleBetweenXZVectors(vec2, vec1)
	return math_atan2(vec1.X*vec2.Z-vec1.Z*vec2.X, vec1.X*vec2.X + vec1.Z*vec2.Z)
end

local function IsFinite(num)
	return num == num and num ~= 1/0 and num ~= -1/0
end

local THUMBSTICK_DEADZONE = 0.2

local LANDSCAPE_DEFAULT_ZOOM = 12.5
local PORTRAIT_DEFAULT_ZOOM = 25

local humanoidCache = {}
local function findPlayerHumanoid(player)
	local character = player and player.Character
	if character then
		local resultHumanoid = humanoidCache[player]
		if resultHumanoid and resultHumanoid.Parent == character then
			return resultHumanoid
		else
			humanoidCache[player] = nil -- Bust Old Cache
			local humanoid = character:FindFirstChildOfClass("Humanoid")
			if humanoid then
				humanoidCache[player] = humanoid
			end
			return humanoid
		end
	end
end

local MIN_Y = math.rad(-80)
local MAX_Y = math.rad(80)

local VR_ANGLE = math.rad(15)

local VR_LOW_INTENSITY_ROTATION = Vector2.new(math.rad(15), 0)
local VR_HIGH_INTENSITY_ROTATION = Vector2.new(math.rad(45), 0)
local VR_LOW_INTENSITY_REPEAT = 0.1
local VR_HIGH_INTENSITY_REPEAT = 0.4

local ZERO_VECTOR2 = Vector2.new(0, 0)
local ZERO_VECTOR3 = Vector3.new(0, 0, 0)

local TOUCH_SENSITIVTY = Vector2.new(math.pi*2.25, math.pi*2)
local MOUSE_SENSITIVITY = Vector2.new(math.pi*4, math.pi*1.9)

local MAX_TIME_FOR_DOUBLE_TAP = 1.5
local MAX_TAP_POS_DELTA = 15
local MAX_TAP_TIME_DELTA = 0.75

local SEAT_OFFSET = Vector3.new(0,5,0)
local VR_SEAT_OFFSET = Vector3.new(0, 4, 0)
local HEAD_OFFSET = Vector3.new(0, 1.5, 0)
local R15_HEAD_OFFSET = Vector3.new(0, 2.0, 0)

local PORTRAIT_MODE_CAMERA_OFFSET = 2

-- Reset the camera look vector when the camera is enabled for the first time
local SetCameraOnSpawn = true

local hasGameLoaded = false

local GestureArea = nil

--todo: remove this once TouchTapInWorld is on all platforms
local touchWorkspaceEventEnabled = pcall(function() local test = UserInputService.TouchTapInWorld end)

local function layoutGestureArea(portraitMode)
	if GestureArea then
		if portraitMode then
			GestureArea.Size = UDim2.new(1, 0, .6, 0)
			GestureArea.Position = UDim2.new(0, 0, 0, 0)
		else
			GestureArea.Size = UDim2.new(1, 0, .5, -18)
			GestureArea.Position = UDim2.new(0, 0, 0, 0)
		end
	end
end

-- Setup gesture area that camera uses while DynamicThumbstick is enabled
local function OnCharacterAdded(character)
	if UserInputService.TouchEnabled then
		if PlayerGui then
			local ScreenGui = Instance.new("ScreenGui")
			ScreenGui.Name = "GestureArea"
			ScreenGui.Parent = PlayerGui
			
			GestureArea = Instance.new("Frame")
			GestureArea.BackgroundTransparency = 1.0
			GestureArea.Visible = true
			GestureArea.BackgroundColor3 = Color3.fromRGB(0, 0, 0)
			layoutGestureArea(PortraitMode)
			GestureArea.Parent = ScreenGui
			
		end
		for _, child in ipairs(LocalPlayer.Character:GetChildren()) do
			if child:IsA("Tool") then
				IsAToolEquipped = true
			end
		end
		character.ChildAdded:Connect(function(child)
			if child:IsA("Tool") then
				IsAToolEquipped = true
			end
		end)
		character.ChildRemoved:Connect(function(child)
			if child:IsA("Tool") then
				IsAToolEquipped = false
			end
		end)
	end
end

if LocalPlayer then
	if LocalPlayer.Character ~= nil then
		OnCharacterAdded(LocalPlayer.Character)
	end
	LocalPlayer.CharacterAdded:connect(function(character)
		OnCharacterAdded(character)
	end)
end
	
	
local function positionIntersectsGuiObject(position, guiObject)
	if position.X < guiObject.AbsolutePosition.X + guiObject.AbsoluteSize.X
		and position.X > guiObject.AbsolutePosition.X
		and position.Y < guiObject.AbsolutePosition.Y + guiObject.AbsoluteSize.Y
		and position.Y > guiObject.AbsolutePosition.Y then
		return true
	end
	return false
end	

local function GetRenderCFrame(part)
	return part:GetRenderCFrame()
end

local function CreateCamera()
	local this = {}
	local R15HeadHeight = R15_HEAD_OFFSET
	function this:GetActivateValue()
		return 0.7
	end
	
	function this:IsPortraitMode()
		return PortraitMode
	end	
	
	function this:GetRotateAmountValue(vrRotationIntensity)
		vrRotationIntensity = vrRotationIntensity or StarterGui:GetCore("VRRotationIntensity")
		if vrRotationIntensity then
			if vrRotationIntensity == "Low" then
				return VR_LOW_INTENSITY_ROTATION
			elseif vrRotationIntensity == "High" then
				return VR_HIGH_INTENSITY_ROTATION
			end
		end
		return ZERO_VECTOR2
	end
	function this:GetRepeatDelayValue(vrRotationIntensity)
		vrRotationIntensity = vrRotationIntensity or StarterGui:GetCore("VRRotationIntensity")
		if vrRotationIntensity then
			if vrRotationIntensity == "Low" then
				return VR_LOW_INTENSITY_REPEAT
			elseif vrRotationIntensity == "High" then
				return VR_HIGH_INTENSITY_REPEAT
			end
		end
		return 0
	end
	
	local camMode = false
	UserInputService.InputBegan:connect(function(key)
		if key.KeyCode == Enum.KeyCode.E and camMode == false then
			this.ShiftLock = true
			camMode = true
		end
		if key.KeyCode == Enum.KeyCode.E and camMode == true then
			this.ShiftLock = false
			camMode = false
		end
	end)
	this.Enabled = false
	local isFirstPerson = false
	local isRightMouseDown = false
	local isMiddleMouseDown = false
	this.RotateInput = ZERO_VECTOR2
	this.DefaultZoom = LANDSCAPE_DEFAULT_ZOOM
	this.activeGamepad = nil
	
	local tweens = {}

	this.lastSubject = nil
	this.lastSubjectPosition = Vector3.new(0, 5, 0)

	local lastVRRotation = 0
	local vrRotateKeyCooldown = {}
	
	local isDynamicThumbstickEnabled = false
	
	-- Check for changes in ViewportSize to decide if PortraitMode
	local CameraChangedConn = nil
	local workspaceCameraChangedConn = nil
	local function onWorkspaceCameraChanged()
		if UserInputService.TouchEnabled then
			if CameraChangedConn then
				CameraChangedConn:Disconnect()
				CameraChangedConn = nil
			end
			local newCamera = workspace.CurrentCamera
			if newCamera then
				local size = newCamera.ViewportSize
				PortraitMode = size.X < size.Y
				layoutGestureArea(PortraitMode)
				DefaultZoom = PortraitMode and PORTRAIT_DEFAULT_ZOOM or LANDSCAPE_DEFAULT_ZOOM
				CameraChangedConn = newCamera:GetPropertyChangedSignal("ViewportSize"):Connect(function()
					size = newCamera.ViewportSize
					PortraitMode = size.X < size.Y
					layoutGestureArea(PortraitMode)
					DefaultZoom = PortraitMode and PORTRAIT_DEFAULT_ZOOM or LANDSCAPE_DEFAULT_ZOOM
				end)
			end
		end
	end
	workspaceCameraChangedConn = workspace:GetPropertyChangedSignal("CurrentCamera"):Connect(onWorkspaceCameraChanged)
	if workspace.CurrentCamera then
		onWorkspaceCameraChanged()
	end
		
	
	function this:GetShiftLock()
		return ShiftLockController:IsShiftLocked()
	end

	function this:GetHumanoid()
		local player = PlayersService.LocalPlayer
		return findPlayerHumanoid(player)
	end

	function this:GetHumanoidRootPart()
		local humanoid = this:GetHumanoid()
		return humanoid and humanoid.Torso
	end

	function this:GetRenderCFrame(part)
		GetRenderCFrame(part)
	end
	
(couldn't fit all)

this is when the toolbox comes in handy (not suggesting u to use it all the time) Just search "force shift lock" then find one and place it in the backpack or where ever the default camera script is and just lock thirdperson click on stater player and set the max zoom to 20 and min zoom to 10