Turn On/Turn Off Window not working?

So I am making something like a reception desk. The person manning the desk can click the window to make it transparent or not. It would also label "Click to start(/end) interviews" to prompt the player to open the window if they are ready for an interview.

function onClicked(playerWhoClicked)
    script.Parent.Transparency = 1 
	script.Parent.Parent.TurnOn.Decal.Transparency = 1
	function onClicked(ClickedAgain)
		script.Parent.Transparency = 0
		script.Parent.Parent.TurnOff.Decal.Transparency = 0
	end
end

script.Parent.ClickDetector.MouseClick:connect(onClicked)

I don't know how to make it work. It would go transparent, but if you click it again, it wouldn't work.

The problem is in the last lines you forgot to run the 2nd function

      end
script.Parent.ClickDetector.MouseClick:conect(onClicked)
end

You could use a numbervalue in the brick. In my opinion, that would be easier. It could look like this:

script.Parent.ClickDetector.MouseClick:connect(function()
	if script.Parent.NumberValue.Value == 0 then
		script.Parent.Transparency = 1
		script.Parent.TurnOn.Decal.Transparency = 1
		script.Parent.NumberValue.Value = 1
	else 
		script.Parent.Transparency = 0
		script.Parent.TurnOn.Decal.Transparency = 0
		script.Parent.NumberValue = 0
end)

local Open = true

function onClicked(playerWhoClicked) -- If you don't want to know who clicked, you don't need this.
	script.Parent.Transparency = Open and 1 or 0 -- If open is true, then transparency is 1
	script.Parent.Parent.TurnOn.Decal.Transparency = Open and 1 or 0 -- If open is true, then transparency is 1
	Open = not Open -- Sets the value of open to it's opposite.
end

script.Parent.ClickDetector.MouseClick:connect(onClicked)

This should work.