Helper in a grocery store.
One summer afternoon my father told me to get in the car to go get groceries with him. When we got t the grocery store I discovered he had met with the manager the day before and gotten me a job. Bag groceries, mop the floor, collect carts, load people's cars, stock shelves, burn trash, (before we stopped using the incinerator), pack ice, unload delivery trucks. They never would let me use the pallet mover though, not sure why. They would let me run a $500k incinerator though... and later the garbage smasher/compactor.
It was a good job and I'm glad my dad did it, although I was angry at the time.
Edit: I started cutting grass with my father's lawn mower when I was seven. I saved my money and had flyers printed. My asking price? $1 an hour. Good times. I had regular customers for three years on my block until we moved out of that neighborhood.