what do you mean due to your lack of work experience? you think you need that to study law?
you need to study what interests you academically. no, it doesn't matter at this point whether you want to become a social worker or a solicitor as law is not a vocational degree and does not equal working in law; indeed a friend of mine went into social work immediately after graduating from an LLB - no did not have to do a Masters in social work so i would disregard the advice from the above user. and, as you've said, you can still become a solicitor with a non-law degree; but fyi human rights is an extremely niche sector and chances are you won't end up there.
have you studied law before and were you good at it? if not go for social work cuz studying law takes a lot of effort if you go to a semi decent uni.