I don't know about the warehouses, but a family member stocked shelves at Target for years, and was paid the minimum wage the whole time. Hours were 1) part time, 2) too inconsistent to allow any other work.
There really isn't a company at that scale that doesn't have problems. I rank Target over Amazon simply because I know the products are going to be legit. Most of the time I'm doing curbside pickup there anyways.