[RememberRonnie]

This sort of thing has long been a labor issue. At the mine, we were paid “from collar to collar”, that was from the time the cage (think elevator) left the surface until when it returned to the surface. The union persistently bargained for pay from the time you entered the change room to dress for work until after you showered and put on your civilian clothes. The union never got their way either by bargaining or by wage and hour complaints.

That's a somewhat different issue. Unless the work clothes are company property (which isn't indicated by the description), the workers could choose to just go home without changing or showering. The Amazon workers in the present case do not have any such choice, and in the view of rational people (as opposed to the clowns on the bench) are clearly "on the clock".

[JimSEA]

They required safety equipment included boots, belt and lanyard, hard hat and lamp. You wouldn’t want to get in your car after a shift with the mud, grease, and dirt which covered you. The contract covered pay from the time you got on the cage, ready for work, until you returned to the surface. It was a negotiated work rule.