Searching for a job
Search for one here - https://www.yalestudentjobs.org/JobX_FindAJob.aspx
You will almost definitely find a level 1 or 2 library job if you apply to a few of them - they generally involve shelving and circulation desk work.
Keep in mind how flexible the hours are and how that ties into your academic schedule.
Level 1: $11.75/hr
Level 2: $12.25/hr
Level 3: $12.75/hr
Level 4: $13.25/hr
Level 5: $13.75/hr
Jobs such as tutoring and grading may have higher rates, depending on the department.