I've stopped using self-checkout because I always run into troubles. In one store when I accidentally double-scan an item, I have to press the button to call so

I've stopped using self-checkout because I always run into troubles. In one store when I accidentally double-scan an item, I have to press the button to call someone, and it takes 5 minutes for someone to show up. In another store you need to place your groceries onto a weighing shelf, and somehow I couldn't figure out what to do to make the machine happy. For produce and pastries that don't have a bar code you have to navigate through a stupid hierarchical menu and I just couldn't find some of the items... At some point these machines hopefully will improve (just like automatic ticket machines have improved), but for now I still prefer waiting in a normal checkout line.