Cameras seem like such a crude expensive approach to doing this. And there has to be exploitable holes. Recently was watching a Western movie where a person go

Cameras seem like such a crude expensive approach to doing this. And there has to be exploitable holes. Recently was watching a Western movie where a person goes into a shop. The goods are all behind the counter. The person points out what they want, the clerk retrieves it. Big vending machines with phone interface possibly. Maybe a full shelf as shown in photo behind wire or glass and a robotic arm like the ones seen in Amazon warehouses. That way people can kick the screen and curse when the robotic arm fails to deliver the correct good and no clerks are harmed in the process.