One household, three schedules
In a house where one person works nights at the hospital, another starts early at a warehouse in the valley and the kids come home on their own, a single front-door key gets passed around until somebody is left standing on the step. The fix is simple: one key for each person who comes and goes on their own schedule, and one spare kept with someone you trust outside the house.
Copies are cut from a good original while the technician is with you. Front door, back door, the door in from the garage and the deadbolt all count, and if those locks don't share a key yet, that's worth asking about on the same visit rather than carrying four keys where one would do.

