The key is in your hand and it did not turn. Spare Key Hook is for that key: the one that stuck, the spare you cannot tell apart, and which door it actually opens.

The Key That Stuck is the lock you are standing at. The Spare Copy is the copy in the drawer and the one you give someone. Which Door is labeling the keys so tomorrow is not a guess.

Each page finishes one key. A minute on the page is an illustrative example unless you are timing your own lock.

When None of the Keys Turn

The front door deadbolt of your ground-floor coastal apartment has sat exposed to salt air and daily rain spray for 18 months, its keyway crusted with fine, abrasive grit even when you wipe its face weekly. You already ran through every key on your daily key ring twice, jiggling each slightly as you inserted it …