I understand you're trying to be helpful, but don't assume others are in the same country as you. And don't assume it's the same everywhere as wherever you are.
There are employees, but if it happens to be crowded, they are all at the registers (unavailable for questions). If they are not, they are stocking some shelves somewhere, but it's 1 or at most 2 people in the whole store, so you can of course go find them, but you'll walk through most of the store until you do. There is no "in the back" anymore for stores around here, as they have very little to no storage. Everything goes straight to the shop floor, with just a sort of staging area (people only go there for literally seconds).