You can seek work as a paralegal, but you will not be a very attractice candidate because of your plan to go to law school (I know this from experience). Check with small firms, maybe. If you want to volunteer, give your local legal aid or public defender office a call. Some of them even pay.
Also, there seem to be a lot of law students who think pre-law school legal experience is worthless. I'm not sure where that attitude comes from, but it is dead wrong. The practice of law is a business with employees, routines, and a particularized way of doing things. The sooner you get some law office experience, the further ahead of your classmates you will be in what matters most, which is the practice of law.
you are dead wrong. emptying trash cans isn't "experiencing the law" and will give you 0 advantage over those classmates who did anything else as an undergrad. if you want to get further ahead of your classmates, all you need to do is do well in your first year of law school. an employer will take a student with good grades in law school over one who "worked in a law firm" since he was able to walk.
and like i had said in another post, a 0L is about as useful as a one-legged man in an ass kicking contest. the only "jobs" they are competent to perform could also be performed by a well-trained monkey.