Why is this part can't dissapear, when I touch it?

So what I want is basically is, when I touch the part it waits 0.4 seconds and then the part disappears... I've trying to figure it out, but I can't.

script.Parent.Touched:Connect(function(hit)	
	if hit and hit.Parent:FindFirstChild("Humanoid") then
			wait (0.4)
				script.Parent:Destroy()
	end
end)

I have had a dumb issue with this. did you put this inside of a script? i think it only works in a script. and, does it just not disappear at all?