If you believe that it’s somehow dangerous for courts to stop legislators from meddling in what ought to be purely private decisions — in particular, that individuals should be free to decide how many hours they’ll work in a week, not a group of politicians.
Nevertheless, progressives constantly whine about one case decided nearly 110 years ago where the Supreme Court ruled that a state had no authority to place a limit on the number of hours a baker could work in a week: Lochner v. New York. Here’s a Vox piece by a writer who is all upset over the fact that Rand Paul thinks Lochner was rightly decided.
Even though both leftists and many conservatives denounce Lochner (and other cases similar to it, where the Court protected freedom of contract against legislative interference), I think the case was correctly decided. For more on it, I recommend the book Rehabilitating Lochner by GMU law professor David Bernstein.