I've now met both of my neighbors for similar reasons. A couple of months ago, the man who lives in the apartment to my north came to my door in the morning to ask if I could let his car out of the garage because he couldn't find his remote control. And then yesterday evening, the woman who lives in the apartment to my south came to my door to report that she was locked out, and to ask if she could climb over the wall that separates our balconies to get in through her sliding glass door. Didn't work -- her sliding glass door was locked. (She ended up going to the manager's mother, who lives elsewhere in the building, to try to find the manager and have him let her in.)