Spoiler for Spoilers:
Okay I guess I can concede to your reasoning to some effect, but I remain baffled that considering their first hand experience of the events (we as limited outside observers aren't privy to a lot of the things they could be seeing), I still find it odd that they never truly attempted to reason through such a door lock mechanism when such a door lock mechanism could explain so many of the door lock problems they're facing.
As for everything esle... well it's because we disagree on the probable perpetrator for this case/episode.
I also have a few questions regarding the episode 2 tips...