I work part-time at my university's library (and am also a student). They favor hiring students, so it was quite easy to get the job and it's a nice supplemental income.
There are many options like you can work in a library as a librarian, can work as a freelancer or you can teach students of lower classes than you.
When i was in high school we had a vica program where u work half day and go to work half day many of us were apprentice in fields such as mechanics welding hvac and most went on to become professionals in that field