Showing how far a double bitted single throw safe key should turn

in video is a Mauer lock, however the same applies to Cawi Wittkopp, Stuv, AGA, FAS, L&F3007
if the correct key stops turning 120° and stops at 60° to 90° then most likely problem is that a tiny piece of key has snapped off. However issues with the boltwork inside safe can also stop the lock opening, foreign objects can cause it too