Maybe a couple of light but sharp raps on it (without the key in it) with a metal wrench or something might loosen the stuck tumbler pins (causing a vibe or shock to the stuck pin).

--Tom 02 TBA; 130 mains; TBS; Nology Coils&Wires;Unifilter/opened Airbox; -AI/snorkels; -2 baffles;Progressive 440s & Springs