Please help! Is this a waste of my time?

I am a junior in college looking to go into Investment Banking. I have a 4.0 GPA and also speak 4 languages.

I don't believe my resume so far is the strongest, but here's the experience I have so far: -summer internship at small accounting firm -Internship (6 months) at mid-sized financial firm - My role was admin assistant

Today I got a call from a law firm looking for a file clerk - part time. I have an interview with them this friday for the position. I always get the impression that it's better to be doing something than nothing...But I wonder, am I wasting my time if I accept that job given it has nothing to do with finance?

Please give me honest advice/feedback.