If it is stuck so the key canโt be turned while inserted in the lock, there is a workouround. With the key in, use vice grips on the lock to turn the whole lock. I did it with no damage to the lock but it is hard to get rid of the rust so better to replace it with a new one of the same size.
2004 E350 Adventurer (Canadian) 20 footer - Alberta, Canada
No TV + 100W solar = no generator needed