I noticed the door behaviour you mentioned in other doors as well. I thought that was a bug, actually :) Some better feedback would be to add visible locking mechanisms on the door; which, when triggered, would move out of the way first, before letting the door leaf/leaves to open up.
Still, the 6A door opened pretty slow, took far longer than the teleport to reset... Actually, that might be the hint. I'll give it another try when I'm a bit less tired.
As for the physics... they really get in the way sometimes, good luck :)