Having difficulty returning my camera after locking onto a BasePart, help?

I'm trying to make a Lock-On Sequence but I can't seem to return the 'current camera' back to the character's humanoid. Would it have something to do with using 'run service' to execute my camera position? I've also tried manually trying to change the Camera's subject and type but it remains unchanged. At this point, I'm convinced it's an issue with 'run service' yet I don't know of another convenient method to manipulate the camera. Would there be another way to format this or is this the most optimal way and I need to run the code differently ( E.g Remote Events or etc.)?

--Services
local UIS = game:GetService("UserInputService")
local runService = game:GetService("RunService")
local Players = game:GetService("Players")
--Variables
local cam = workspace.CurrentCamera
local player = Players.LocalPlayer
local dummy = workspace.Dummy
local target = dummy.Head
local Check = 0
--Script
UIS.InputBegan:Connect(function(input)
    if input.KeyCode == Enum.KeyCode.L then
        if Check == 0 then
            Check = 1   
    wait()
runService.RenderStepped:Connect(function()
    cam.CameraType = Enum.CameraType.Scriptable
    cam.CameraSubject = target
    local character = player.Character
    if character and character.UpperTorso and character.Head then
        local torso = character.UpperTorso
        local head = character.Head


        local ZPosition = Vector3.new(head.CFrame.X, head.CFrame.Y + 2,  head.CFrame.Z)
        cam.CFrame = CFrame.new(ZPosition, target.Position) * CFrame.new(2, 0, 8)
        cam.Focus = CFrame.new(target.Position) 
end
end)
    elseif Check == 1 then
            Check = 0
            print("Off")
            workspace.CurrentCamera.CameraSubject = player.Character.Humanoid
            workspace.CurrentCamera.CameraType = Enum.CameraType.Custom 
        end
        end
    end)