Mr. Green working at Amazon warehouse job now, lol. They do use robot but it's not what people think. The robot have no arms but nothing more than moving square hand jack. It move into position and lift the pod around. The pod require people to place item into them for storage, call Stowing, and require people to pick them for customer's order, call Picker. They do hire all age, ***, nationality. Most of the positions are labor intensive but some lucky few get to do light work like auditing and problem solver.
This is their strategy of bringing the product/business closer to the customers. The warehouse is like 2 to 3 square blocks. It takes 5+ mins just to walk back from break.