I don’t think it’s necessarily quite as clear cut as ‘working on the till’ and ‘humping stuff about in a warehouse’.
I didn’t work for next, but another high street fashion retailer. But there was days when I didn’t even touch a till, never mind get to stand behind it.
Our deliveries had to be collected from our service yard and taken to the stockroom by the same staff as operated the tills (some large stores had specific teams for this, but not most smaller ones). They weren’t carrying the same volume of stock, but the stock that we were wasn’t lighter for us.
Any item missing from a delivery, would show up on our stock loss (because it was just assumed that the error was in store). So it had to be checked off in-store, (time consuming and annoying, not necessarily mentally taxing. But I’d argue no less mentally taxing than counting the right number of items in the warehouse to begin with). The responsibility of filing the paperwork (to prevent a financial loss) was entirely down to the in-store team. (Not a physical job, but vital to the business economics).
Those deliveries once processed/hung/tagged etc need to be put out onto the shop floor (again, some stores will have set teams for this/out of hours staff but not the smaller ones). Running a 300+ item delivery downstairs is physically demanding.
Then there’s the moving stock from the upstairs to downstairs, and round the store (replen, moving the stock round the floor etc) That can be heavy and physically demanding. (We couldn’t just carry a couple of pairs of jeans at a time, we needed to bring 10/15/20 in our arms at once. An entire shift can be spent running around on ‘replen’.
Then there’s changing the graphics/light boxes/ displays etc. Depending on what’s in your store this can be incredibly physically demanding (again some stores will have designated teams for this kind of thing, but lots won’t).
And there’s the ‘risk’ that comes from dealing with the public (different to carrying heavy stock all day, but still a risk). There was the man who leaned over the till and told me to “watch what happens” if I didn’t give him exactly what he wanted. The man who in a fit of rage (we never found out why) punched a mannequin over that literally bounced off the floor next to a manner of staff. There was the guy who pushed a huge metal fixture at me (I was pregnant at the time, although he had no way of knowing that), so he could steal an arm full of expensive jackets from where I happened to be stood.
There’s the responsibility of ensuring the store is clear of customers every time there’s a fire alarm. There’s the cleaning up vomit, children’s and a drunk woman who got too ‘merry’ on black eye Friday. We found more soiled underwear in our changing rooms than I could ever have imagined.
I’m not disputing that the warehouse staff deserve their pay. But it’s disingenuous to pretend that a lot of these shop staff are just standing behind a till. I work for the prison service now, and honestly I’m treated better. At least people acknowledge that what I do is rubbish now.