Claw arcade game machines are good for only one thing: eating children. They rarely pick up any prizes because the claws are too weak to hold any object heavier than a feather.
This variation, though, looks more profitable. It requires a human child for operation. Go get one. I'm not going to ask where you got it. Just get one and come back.
Once you have the child, strap it into the harness. The child's arms, though weak compared to an adult's, are strong enough to grasp a large amount of loot.