Early in our dating, my (now) wife moved into a new apartment and accidentally turned in the key to the back patio storage room with the keys to the old place. She was embarrassed to ask the old landlord, so she asked me to ask him. Instead, I popped home, picked open the patio storage lock, and then re-keyed the lock to match the front door. When I was a teenager I bought a (apparently lifetime) supply of assorted lock pins.