I take it this town is abandoned? Even so, what kind of shopkeeper or motel manager keeps their key in somebody else's building?
The anwser is 4152 because H=22 there is 26 letters in the alphabet. Assuming 26 is the max number.
L=26, so M = 1, N= 2, etc. A= 15 because it is 7 or so letters before H
Finally the other guy doesn't look too happy about the situation! Not that I enjoy his misery, but so far it's been a bit unrealistic how he's seemed happy all the time, all through the disaster. In this episode you could feel the fatigue a bit more; wonder what was about to happen. NIce work!
it was 4152?! but that has nothing to do with pan or h=22