What if the manual is inside the doors? [ that's what he's convinced of anyway because it sounds confident. ]

If we know how many digits they are, we can try every possible combination and start to narrow it down. But if there's a lock-out protocol- [ they have to be careful. he's just thinking aloud at this point. ] Or it decides to eat us again. [ he shoots her a look, noticing how she keeps getting closer and just barely holding back his sigh. at least this doesn't seem as dangerous as trying to force the doors open. ]