Working in an Amazon warehouse is a pretty average blue-collar job these days. You're a slave to the time clock, you're on your feet all day, walking miles and miles, but other than that there's no real extremes. In every job you're expected to get a # of parts out per hours or ship so many package.
But the good thing about an Amazon warehouse, is you're not standing next to a heat-treating oven, sweating your bag off. You're not mixing dangerous chemicals that could poison you and requires you to wear an uncomfortable ventilation system or suit.
There are no fiberglass matting slivers to get in your arms or eyes. There are no 20 ton presses that will crush you in the blink of an eye. You're not outside in the freezing cold. You're not standing around in a meat freezer hacking away at a side of beef with a giant knife.
Is it the greatest job in the world? No, but there are a limited supply of those and competition for them is very high. Is it worst job? Far from it. And 30 years ago it would have been considered pretty cushy.