Script won't work in Play?

It works when I go to Play Solo mode, but when I press Play, the script won't work. I know that it has no mistakes but why won't it work?

H = game.Workspace.Door

function onTouch(Door)
H.Transparency = 0.5
H.CanCollide = false
wait(5)
H.Transparency = 0
H.CanCollide = true
end

script.Parent.Touched:connect(onTouch)

script.Parent.Touched:connect(function(hit)
	local h = game.Workspace.Door
	h.Transparency = .5
	h.CanCollide = false
	wait(5)
	h.Transparency = 0
	h.CanCollide = true
end

Not sure if that will help, but try it out.

If it doesn't work, comment.

That is an (onTouch) script, so when you click "Run" there's no character to touch the door. So therefore if you test it in "Solo Mode" it will work because a character is in the game touching the door.