Not sure why you're viewing this as a class issue. If you work at the supermarket and can't find anyone to help with a purchase at the hardware store after work (or vice versa), you're suffering inconvenience despite being in the same class.
Meanwhile, the people who are working there stocking/ cleaning/ etc are suffering constant interruptions by frustrated customers who can't find what they're looking for. On paper, their productivity looks poor because it takes them longer to perform any given task while the store is open and this is probably offered as an excuse to limit wage increases or promotions, since one can hardly write up a service ticket for every spontaneous customer inquiry.
