I don't think many minimum-wage retail or service workers can just "vote with their feet" and easily get another job, especially if you don't consider major changes in location and hours to be a non-starter.
For folks with kids, or who depend on public transit to get to work, "up and moving" isn't really an option. If you're one missed paycheck away from eviction, bankruptcy, or arrest due to missed fines or court fees then you can't play "hardball" with your employer.
Saying the arc of history improves overall cruelly glosses over the reality today for millions of Americans.