Not OP but some stores have these hyper-sensitive scales you put your bag/scanned items on. They can be super annoying as tiny differences in the weight will lock up the entire thing and you need someone to unlock it again. E.g. if you didn’t start with all your bags already on it and you try to add a new bag. Or the area is full and you want to remove and already full bag. Or you nudged something with your leg while scanning the next item.