In Wellington (I live there) there's a QR code on every shop you're supposed to scan with your phone for contact tracing. Most people don't but they still see them - so yes it's still on our minds.
There are supposed to be QR codes here. I only visit one place, to buy food every 7-9 days, they don't have a QR code and employees seemed confused about what one was or why I might be surprised not to see one. I gave up rather than expend any more time trying to have a conversation through masks with confused people about something they can't fix.
They did, I noticed when I last visited yesterday, begin explicitly telling people that "One adult shopper" does not mean, "What a fun outing, let's all go to the store as a family and increases everyone's exposure for no reason".
It was striking to me how few masks and how little QR scanning was going on in Wellington when I went there from Auckland.
Auckland has slipped a lot, but it seemed way slacker in Wellington.
What does improve compliance is an actual negative event. The change in public reaction to funeral restrictions in lock down when people attending a funeral got sick (and I think one died?) was noticeable. Reported consequences make the policy much harder to ignore. And if there hasn't been enforcement the way human memory works, if on Tuesday a human decides complying with a rule is good, they are now more likely to remember having complied with it on Monday, and retrospectively they will come to believe "obviously" they always obeyed that policy, it was the sensible thing to do.
That's cheaper and more effective than policing. But it may cost a few lives to provide the example.
This would encourage employees to ask shoppers.