What is wrong with my Sliding Door script?

I'm working on an onTouched sliding door script, but for some reason when I touch the brick, the Door doesn't slide, it just teleports, and it doesn't teleport to where I want it to stop either. It disappears when I hit the brick.

function onTouched(hit)
    debounce = false
    player = hit.Parent
    increment = 0.1
    if hit.Parent ~= nil and debounce == false then
        debounce = true
        repeat
            wait(0.01)
            pos = 33.5
            script.Parent.Parent.Door.CFrame = script.Parent.Parent.Door.CFrame * CFrame.new(86.222, pos - increment, 85.573) 
            pos = pos - increment
        until
            pos == 18.5

        wait(3)
        repeat
            wait(0.01)
            pos1 = 18.5
            script.Parent.Parent.Door.CFrame = script.Parent.Parent.Door.CFrame * CFrame.new(86.222, pos1 + increment, 85.573)
            pos1 = pos1 + increment
        until
            pos1 == 33.5
        debounce = false
    end
end

script.Parent.Touched:connect(onTouched)