I'm sorry but allowing 12 year olds to work unlimited hours sounds like slavery to me. I wonder how much these children are paid?
You are completely misunderstanding the "unlimited hours" aspect. The reason that farm labor is deliberately unlimited is because sometimes, for very short bursts, there exists a need to go harvest stuff quickly. Food that is about to rot in the field can't wait for the same asshat bureaucratic rule-maker idiot to render a verdict. So farming families have a pass on the normal rules that encumber most other types of family businesses.
"Unlimited hours" doesn't mean that there's some jerk making kids work an infinite amount of time. It means literally what it says. It's not limited, in the passive voice sense. There is no idiot outsider who knows almost nothing about how food is pulled up out of the ground who is given power to direct how farm labor is applied.
I had working papers but no one would hire me. Babysitting was about it.
That lack of skill and education also means that you are probably one of the last people who should be trying to effect changes in the policies that direct how your food is provided to you.
When picking berries you get paid by the flat....the kids are helping their family earn money. I first did this when I was about 10 years old (my sister was 9, and my brother was 7).