If the business is an upscale business, and they want to service the high end buyer, they will protect their property using extreme security measures, entry to only the exclusive via agreed upon a dna match , or facial and finger print recognition.
The buyer will feel very 'special' knowing that the 'rifraf' will be kept out using "border guards".
Would you like to walk into a say, Walmart, knowing that while you are armed, many known criminals, are being prevented from entry because of some exclusion technique that keeps known felons, shoplifters and rapists out?
The idea can be scary, but being shot in the head can be worse.
A simpler method is to just close storefronts and operate on a delivery basis only.