GUI open script doesn't work?

So, I used this to make a GUI open by a part touch, but when I tested it in studio it worked, in game.. It worked when I touched it while I was alone in the server, but when I told someone to join the part didn't open to GUI for me, or the other person...!

debounce = false
GUIopen = script.Parent.Value

function onTouched(hit)
    local plr = game.Players:GetPlayerFromCharacter(hit.Parent)
    if plr and debounce == false then
		if GUIopen.Value == false then
       		debounce = true
       	 	GUIopen.Value = true
			wait(0.1)	
			plr:WaitForChild("PlayerGui").TeleportMenu.Background.Visible = false
        	debounce = false
		end
    end
end

script.Parent.Touched:connect(onTouched

Help please D:

Ok I finally found out what your error was, The error was the use of Debounces, Here is the fixed Code:

debounce=false
function onTouched(hit)
local plr = game.Players:GetPlayerFromCharacter(hit.Parent)
wait(0.1)
if not debounce then
debounce=true
plr.PlayerGui.TeleportMenu.Background.Visible = false
end
debounce=false
end

script.Parent.Touched:connect(onTouched)

I edited it a bit, I changed the Postitions of the Debounces, If there are any errors just comment below.

Note: I had removed the BoolValue