Let's see if we can pin point the problem.
Did you hear breaking glass when you left the bathroom the first time and can you get into the door around the back next to the dumpster?
Just tested it out myself and I can't spot anything obvious that's wrong...the door round the side should open by itself at this point.
I will keep looking to see where the problem is, but for now I have just finished a bunch of optimizing and uploaded the updated file.
Might be worth downloading the new one and seeing if it's any better.