law worker is not a term that would be used in English. A person who is qualified in law is known by different terms, such as solicitor or barrister (in British English). I think Americans use the terms lawyer and attorney? There are also para-legals who perform support roles. As far as I know there is no single term to refer to someone who works in the law profession, regardless of role.

Following on from Hilary's answer, the most generic term would be "lawyer" but in many contexts this would imply someone who was professionally trained in law, and not just someone who worked in law.