I worked part time as a dishwasher for around 6 years in middle/high school, at a restaurant with no machine, just three sinks and a huge counter. It's definitely a good way to get into the restaurant industry, but also a great way to learn if you hate working at a restaurant.
Related to the importance and underappreciated status of dishwashers... I only sometimes washed dishes at middle school. If you wanted the cafeteria "hot lunch", but your parents didn't pay for it, you could get it that day by volunteering to wash everyone's trays, in lieu of recess. Personally, I think this wasn't a great lesson. In the current very inequitable US environment, I support simply giving nutritious food…
That's becoming more common. My school district just announced they have funding to give all students free breakfast and lunch for the next three years. They got that funding through the government (and I think it may have come all the way from the feds). We're not a low income district, so I assume that funding is easily available.
Even before then, it was mostly a "pay if you can" policy. The kids have accounts and they punch in their ID number when they go through the lunch line, but it would never refuse even if the account balance was negative. They'd ask parents to bring the balance positive, but it was never revealed at the student level that someone did not have adequate funds.
Slowly but surely we're trying to make sure students can focus on school. Hard to make everyone's home life ideal, but we do what we can. Hopefully this translates to their increased success in life and each successive generation will improve.