Sample answer
I do not hand someone keys because they are available. I let them run a close with me, then a close I watch from the floor, then a close I trust. I teach the parts that carry risk: opening and closing procedures, the alarm, loss prevention, and who to call. I also teach them they can hold a policy and handle a customer conflict without freezing. If they want the keys for the extra hour and not the responsibility, I do not push them through. Development is a next step they can see — then a check — then more trust.
Your story to swap in: Name someone you trained toward keys. What did they run alone before you left them with the close?