In high school I worked as a library clerk. Our library was small with only a handful of patrons at a time. I spent the first couple hours of each shift shelving books and doing other data entry tasks, then the rest of the time I pretty much worked on whatever I wanted. The other lady that normally worked with me liked to spend her time reading books.

Working on stuff at the library can have other advantages too. It's a quiet workspace mostly free of distractions, and you have easy access to lots of reference material.