Admins, remove this question?

Every change I made:

wait(0.1)
local Player = game.Players.LocalPlayer
repeat wait() until Player.Character and Player.PlayerGui
local Camera = workspace.CurrentCamera
local Mouse = Player:GetMouse()

local Gui = Instance.new("ScreenGui", Player.PlayerGui)
Gui.Name = "Target"
local T = Instance.new("TextLabel", Gui)
T.Size = UDim2.new(1, 0, 0.035, 0)
T.Position = UDim2.new(0, 0, 0.7, 0)
T.Text = ""
T.TextColor3 = Color3.new(1, 1, 1)
T.TextWrapped = true
T.TextScaled = true
T.BackgroundTransparency = 1

local Enabled = true
local Crouching = false
Player.CameraMode = "LockFirstPerson"
Player.Character.Humanoid.WalkSpeed = 12

for i,v in pairs(Player.Character:children()) do
    if v.ClassName == "Part" then
        v.Transparency = 1
    elseif v.ClassName == "Pants" or v.ClassName == "Shirt" or v.ClassName == "Hat" or v.ClassName == "CharacterMesh" then
        v.Parent = nil
    end
end

Mouse.Move:connect(function()
    local Target = Mouse.Target

    if Target then
        Target = Target.Parent
        if not Target then return end
        Target = Target.Parent
        if not Target then return end
        local Mag = 9

        if Target.Name == "Door" then
            Mag = (Player.Character.Torso.Position - Target.Main.Position).magnitude
        elseif Target.Name == "Examine" then
            Mag = (Player.Character.Torso.Position - Target.Body.Torso.Position).magnitude
        end

        if Mag <= 8 then
            if Target.Name ~= "Examine" and Target.Name ~= "Door" then return end
            if Target.Name == "Examine" and not Target.Examinable.Value then return end
            if not Enabled then return end

            T.Text = "Press E to " .. Target.Type.Value .. "..."
        elseif Mag > 8 then
            T.Text = ""
        end
    elseif not Target then
        if not Enabled then return end
        T.Text = ""
    end
end)


Mouse.KeyDown:connect(function(k)
    k = k:lower()
    if k == "e" then
        if not Enabled then return end
        local Target = Mouse.Target
        if not Target then return end
        Target = Target.Parent
        if not Target then return end
        local Mag = 9

        if Target.Name == "Door" or Target.Name == "Examine" then
            Mag = (Player.Character.Torso.Position - Target.Main.Position).magnitude
        end

        local N = Target.Parent.Name
        if Mag <= 8 then
            if N == "Examine" then
                Target = Target.Parent
                if not Target.Examinable.Value then return end

                Enabled = false
                Camera.CameraType = "Scriptable"
                Camera.CameraSubject = Target
                Camera.CoordinateFrame = Target.Cam.CFrame
                Camera.Focus = Target.Body.Torso.CFrame
                Player.Character.Humanoid.WalkSpeed = 0
                T.Text = Target.Text.Value

                for i,v in pairs(Target.Items:GetChildren()) do
                    local C = game.ReplicatedStorage:FindFirstChild(v.Value)

                    if C ~= nil then
                        C = C:clone()
                        local C1 = C:clone()
                        C.Parent = Player.StarterGear
                        C1.Parent = Player.Backpack

                        for k, l in pairs(C:children()) do
                            if l.ClassName == "Part" then
                                l.Anchored = false
                            end
                        end

                        for k, l in pairs(C1:children()) do
                            if l.ClassName == "Part" then
                                l.Anchored = false
                            end
                        end
                    end

                    v.Parent = nil
                end

                Target.Rem.Parent = nil
                wait(2)
                Camera.CameraType = "Custom"
                Camera.CameraSubject = Player.Character.Humanoid
                Player.Character.Humanoid.WalkSpeed = 12
                T.Text = ""
                Target.Examinable.Value = false
                Enabled = true
            elseif Target.Name == "Door" then
                if Target.Lock.Value == true then
                    Enabled = false
                    T.Text = "This door is locked! Find a key to open it."
                    wait(2)
                    Enabled = true
                    return
                end

                if Target.Open.Value == true then return end
                Target.Open.Value = true

                for i = 1,78 do
                    wait()
                    Target.Main.CFrame = Target.CFrame * CFrame.new(0, -0.1, 0)
                end

                wait(2)

                for i = 1,78 do
                    wait()
                    Target.Main.CFrame = Target.CFrame * CFrame.new(0, 0.1, 0)
                end

                wait(1)
                Target.Open.Value = false
            end
        end
    elseif k == "c" then
        if Crouching == false then
            --_G.Crouch(true)
            Crouching = true
        elseif Crouching == true then
            --_G.Crouch(false)
            Crouching = false
        end
    end
end)

Mouse.Button1Down:connect(function()
    local Target = Mouse.Target
    if not Target then return end
    Target = Target.Parent.Parent
    if not Target then return end

    if Player.Character:FindFirstChild("Key") then
        if Target.Name == "Door" then
            if Target.Lock.Value then
                if Player.Character.Key.Handle.BrickColor == Target.DoorColor.Value then
                    Enabled = false
                    T.Text = "Successfully opened door!"
                    Target.Lock.Value = false
                    Player.Character.Key.Parent = nil
                    wait(1.5)
                    Enabled = true
                    T.Text = ""
                elseif Player.Character.Key.Handle.BrickColor ~= Target.DoorColor.Value then
                    Enabled = false
                    T.Text = "This key does not fit the keyhole!"
                    wait(1.5)
                    Enabled = true
                    T.Text = ""
                end
            end
        end
    end
end)

Is it possible that it's not the script, and just your setup of the hierarchy? (That a value is false when it should be true by default, or vice versa)

It looks like the code SHOULD work. The best way to debug is to add print("Test #[NUMBER]") or something like that, to see where it doesn't go when it should.