More doors than people remember
Ask someone how many locks their house has and they will usually count the front door and the back. Walk around with them and the list grows: a patio slider, the door from the garage into the kitchen, a basement entry, a shed, a gate latch, the mailbox. Each one has its own key, its own age and its own way of failing.
A residential visit starts with that walk. Every lock that keeps someone out gets looked at, the ones in good shape are left alone, and the ones that are worn, mismatched or missing are pointed out before anything is touched.

