well if we can not open any of the doors lets move back down stairs asap. Other wise open and explore what rooms we can.
plenty of choice, only the door at the end is locked, and we might or might not be able to open it.
my guess is that we probably need a new key for every new door, and any key we find will open the first door we try it on, and only that door.
it's still the sanfilippo's turn anyway.