Just a quick peek at current on-campus listings: (you might need to register to view them)
Museum shop sales assistant; 12-20 hours a week; $11/hr
https://gwu-csm.symplicity.com/students/index.php?mode=form&id=f71c1526a863e3492df100d5559326c2&s=jobs&ss=jobs
Staff Assistant - Admissions and Student Advisor Support; 20 hours a week; $9.50/hr
https://gwu-csm.symplicity.com/students/index.php?mode=form&id=5db92c911644c11bd6a2464de9ebae32&s=jobs&ss=jobs
Colonial Connection Caller; 10-15 hour a week; $11.50/hr
https://gwu-csm.symplicity.com/students/index.php?mode=form&id=3d4dafa04c5e8a025392de875c36a0ba&s=jobs&ss=jobs
These are just a sample of the kind of jobs you’ll be able to find. February isn’t the best time to find an on-campus job, lol. If you started looking in August you’d be set for the new academic year.