Repair, rekey, or replace in St. Francis
Begin with the problem you want solved.
If the key is hard to turn, the goal may be dependable operation. If an old tenant or employee may still have access, the goal is a new working key. If the hardware is damaged, loose, heavily worn, or unsuitable for the door, replacement may be the practical route. Those are different goals even when the call begins with the same word: lock.
Rekeying does not fix a sagging door. New hardware does not automatically correct a strike that is out of position. A smart lock cannot perform well if its motor must force the bolt into the frame. The opening needs to be considered as a system, but the recommendation should remain simple enough to understand.
Ask what the proposed work will change and how the result will be tested. A clear answer should connect the symptom, the work, and the final check. That is more useful than receiving a list of parts without knowing which part solved the problem.