When I was 14, I also "worked" at the blueberry farm. I was paid $2 per bucket of blueberries. Since, I was pretty slow, that worked out to about $2 an hour.
I didn't really think my kids would enjoy picking blueberries, not yet. Christopher lasted about 15 minutes before he was done. He then finished eating the blueberries in his bucket and started eating handfuls out of mine. Ashlyn last about 45 minutes, before she started wandering off.