I don't get there often enough to know. I would assume it's rare, and ALDI shopper is different than say, a Wal-mart shopper.
Museums, libraries, and train stations aren’t places I go weekly, like a grocery store. When I do go, I can’t remember the last time I ever used a public locker. I can count on one hand the number of times I’ve used one of those in my life. I don’t tend to carry much stuff with me, so a locker isn’t something I generally need.