The store could be made appointment only. Require customers to download and use an iPhone-only app to make the appointment. The app should not be free but cost $5, be English only, and use big words to navigate the appointment making process. All purchases must be made with a credit card, with no cash, debit, or EBT accepted. While initially annoying, customers could be offered free Pumpkin spice lattes and would soon come to appreciate the new retail shopping experience.
This reminded me of the movie Hot Fuzz. The proprietor should have the door locked & just buzz people in ONE AT A TIME. That should cut down on a lot of the retail theft.