Zombies? Technically, no. The customers are soulless beings, but I think that they were born without them. They are “living” creatures after a fashion, not undead.
The workers are not zombies either. Most of them leave their souls (and, in some cases, their minds) at home as a matter of self-preservation.
My question on the Walmart test was something about, “It is okay to use drugs as long as you do not do so at work.” I picked “Somewhat Agree” and they wanted to know why. “Well, alcohol is a drug, and since it is legal, I don’t really have a problem with people using it as long as they don’t come to work drunk.” Poor woman didn’t know what to do with me.