I used to work in a library at my college (while in undergrad). I believe there were also some high-school graduate workers employed there too. It was a very easy job that mostly composed of gathering book requests and preparing them for patrons. I say it was a 80% free time and 20% work split. Another good job in my experience was lifeguarding, some cities even pay as high as $11/hr for an entry level position, most of the time it's 50/50 with work and break time or 70/30 work / break time.