I am having problems?

I wrote this script:

Door1 = game.Workspace.Structure.Door.Left
Door2 = game.Workspace.Structure.Door.Right
t = false

function onTouch(hit)
	if t == false then
		t = true
		for i=1,20 do
			Door1.Lock3.CFrame = Door1.Lock3.CFrame + CFrame.new(0,1,0)
			Door2.Lock4.CFrame = Door2.Lock4.CFrame + CFrame.new(0,-1,0)
			wait()
		end
		wait(10)
		for i=1,20 do
			Door1.Lock3.CFrame = Door1.Lock3.CFrame - CFrame.new(0,1,0)
			Door2.Lock4.CFrame = Door2.Lock4.CFrame - CFrame.new(0,-1,0)
			wait()
		end
		t = false
	end
end

script.Parent.Touched:connect(onTouch)

Then appears this message: Lock 3 is not a valid member of Part.

Lock3 does not exist. That is your problem.

Can you please provide the full output error? Secondly, What are you trying to do?