Most if not all (the candy doesn't get stolen) the shelves have plexiglass, and there's buzzers placed every so often on the shelves. When you want someone, you press the buzzer and wait (usually pretty long) as they find you and open up the case. Repeat for multiple shelves. Also take into account that they downsized staff in all of these places, so sometimes it's literally the cashier that has to run up to the shelves. It's awful and the main reason I just stopped going and Amazon Prime everything now.