Key opening door script not working, door not opening?

So i made a door with a key to open it and you pick up the key by stepping on it and then you put it in the door lock, like it touches the lock, and the door disappears. It was working before i deleted a script i made an "E to pick up tool script" which had no interference whatsoever with the door lock script. Now it does not work for anyone in game, please help heres the script:

--script start--

db = 0 function unlock(part)

if db == 0 then
	db = 1
	
	if part.Parent.Name == "Key - Level 1" and part.Parent:isA("Tool") then
		part.Parent:Destroy()			
		
		local doorParts = script.Parent.Parent:GetChildren()
		
		for i = 1, #doorParts do
			doorParts[i].Transparency = 1
			doorParts[i].CanCollide = false
			
			end
		end
	end		
end

db = 0

script.Parent.Touched:connect(unlock)

--script end--