Script dosent work despite "WORKED!" Being printed, and no errors in output?

So this is a script inside a part called "HandleGlow", and it makes a door locked sound, and show a GUI with a text label saying: "Its locked". however, when I clicked it, everything worked, the output printed "WORKED!", the sound played, but the GUI didnt show up. Here is the script below. Please help me!

local clickDetector = script.Parent.ClickDetector
 --Mouse hover stuff VVVVVVV--
script.Parent.ClickDetector.MouseHoverEnter:Connect(function()
	
script.Parent.Parent.HandleGlow.Transparency = 0.75
end)
--Mouse Leave stuff VVVVV---
script.Parent.ClickDetector.MouseHoverLeave:Connect(function()
script.Parent.Parent.HandleGlow.Transparency = 1
end)
--Door Stuff VVVVVV--
function onMouseClick()
script.Parent.DoorLocked:Play()
local A = game.StarterGui:FindFirstChild("LockedMessage")
A.Enabled = true

wait(5)
A.Enabled = false
print("WORKED!")
end
 
clickDetector.MouseClick:connect(onMouseClick)

The reason that it isn't showing the gui is that your enabling the gui in the starter gui. You need to enable it in the Player gui. Here is your revised code:

local clickDetector = script.Parent.ClickDetector

--Mouse hover stuff VVVVVVV--
script.Parent.ClickDetector.MouseHoverEnter:Connect(function() 
	script.Parent.Parent.HandleGlow.Transparency = 0.75
end)

--Mouse Leave stuff VVVVV---
script.Parent.ClickDetector.MouseHoverLeave:Connect(function()
	script.Parent.Parent.HandleGlow.Transparency = 1
end)

--Door Stuff VVVVVV--
function onMouseClick(Plr)
	local PlrGui = Plr:WaitForChild("PlayerGui")
	local Gui = PlrGui:WaitForChild("LockedMessage")
	script.Parent.DoorLocked:Play()
	Gui.Enabled = true
	wait(5)
	Gui.Enabled = false
	print("WORKED!")
end
 
clickDetector.MouseClick:connect(onMouseClick)

Happy coding to you