Fine. Do your shopping on a terminal. When you have finished shopping, run your debit card. If the payment clears, your order will be available at the "will call" counter in exchange for the printed receipt with a bar code identifying your order. On delivery of the goods, the receipt system marks it delivered and the receipt is invalid for additional demands. No shoppers in the warehouse area. A secure website will be available for those who wish to shop from home before coming to claim their purchases at will call.
Warehouse space is cheaper than commercial retail space. No shoplifters. No annoyed shoppers working around the shelf stocking clerks. No shelf stocking clerks. Perhaps completely automated robotic warehouse.