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If you're ground level, there is no bulletproof solution that will stop from one running in from street front / loading bay. I worked in a Michelin star place where even the dry store got hoovered and mopped once a day, and we still had mice running in every once in a while.
Then I also worked at a rooftop place that was just a hard to clean environment (rustic wood panels with cracks inbetween...etc), there it took a good 3 months of combined pest control & deep cleaning routine to get rid of them. Makes for great conversation with the guests.
They shouldn't let the humans in, then.
Mice are lovely animals, the only problem is that they're wild animals in the wrong place. I don't want to call them 'pests'. They just want to live and find food, and it's 100% not their fault when they're born in cities.