Hold on there! What's this "trade ID for a key" business???The facility provides locker, you trade a ID for a key,
One other point to consider: the lockbox setup itself is of no value in protecting the visitors from harm, if its purely voluntary. The only real security setup worth its salt is the one that actually have at all the large-county courthouses: lockboxes plus metal detectors to have some chance at finding those who don't comply.
- I might need my ID for whatever business I'm doing at the place.
- Who's business is it who I am, if all I'm trying to do is comply with their no-weapons/lockbox regimen?