I’d be surprised if this is still this easy, but I got my first job opening up cases at the antiques store with no relevant experience. It was perfect – I’d grab a clipboard and pretend to be taking inventory while just doodling and somebody would occasionally need a case opened. Was it one key for all of them? I can’t remember having to think about or fetch the keys, so it really may have been one key for all the cases. Open, let the person inspect, close up and walk them to the counter and wrap it up if they’re buying. The customers weren’t perfect, but you’re not going to get a twitchy-eyed chud breathing down your neck to hand them their order so they can peel out of the parking lot. My whole time I was there we had one incident and the guy ran off before the owner could call 911.
They were display cases, glass cupboards with two sliding doors with a lock on the bottom. It was a consignment shop, so to satisfy everyone selling there who thought their their antiques were so unique and special that batman villains would try to finesse them, all the cases were locked at all times with a key only entrusted to a kid who wanted a job within biking distance. There were a lot of cases because there were a lot of antiques because the town was a hotbed of antiques. Like if I looked up the top antiques towns in the US, it would be yeah, still first page.