I don't mean this to sound harsh, only honest, so please take it as such. Entertain the possibility that your experience in the real working world is so limited that you don't actually know what you want to do, only think you know. And you think it's the legal field. In the mean time, take the first job you are offered. If you have honestly been offerend NO jobs in your searching yet, keep searching...you're in a traditinally bad time to be looking right now, the late winter months after all the holiday broo-hah has gone away, but keep looking.
When you finally have that job you hate, keep looking for something better even as you work, there's no law against that. But don't fall into the self fulfilling prophecy of hating any job not connected with your college education, and miss something you might really find fulfilling just out of spite. More people than not go on to careers unrelated to thier education, and often even beyond thier wildest ideas.
If you see someplace with a help wanted sign, do not go in there to see about getting a job. Go in there to DO the job; show up to work right that very minute. If you're unfamiliar with the place, make a quick fly-by to see how employees are dressed, groomed, etc and then go look like them, and quickly. Then you walk in the door, talk to whoever is in charge and tell them right out, "I see your help wanted sign, and I'm here to help." Yeah, that takes a little chutzpah, but it's how I got the job I've been doing for 21 years...a job unrelated to my degree, and that I didn't even realize existed as I piloted the waters of a late Master's degree program. It wasn't what I "wanted" to do at the time (although when I saw it, it did interest me terribly) And I'm not the only one I know who has gotten in the door that way.
So very often though, getting a job really boils down to just pure, bullheaded perseverance. So keep looking, and understand that the people who seem to have a problem with you looking (like the work agency you spoke of) have the problem, not you.