https://www.bls.gov/IAG/TGS/iag70.htm tells me that the average hospitality worker is working 25 hours a week. Did we have another huge fight to bring the 40 hour work week down to 25 hours? I suspect not, or people would talk about that instead of the 40 hour week. That victory looks a bit hollow - much like any successes in pitching a minimum wage of low single digit dollars per hour which has been rubbed out by inflation.
Even the child labour one is interesting - children are unemployable regardless of the law, they don't have the skill, stamina or strength to participate meaningfully in a modern economy. It makes a difference, but this is a ban on something that doesn't make much economic sense to start with. This isn't a meaningful political question these days, the economy has no use for children. Child labour went the way of slavery - any society attempting to utilise it will get steamrollered by capitalists using productive techniques to do an order of magnitude better.