As mentioned by others the labor laws are all over the place from state to state. The first thing to check is the employee manual that the employer should have given you a copy of when you were hired. Without a written statement from your employer your benefits are whatever they say they are at the time they state them. California is what they call a "Wright to work" state. That means you have the wright to work for however long the employer wants you to work for whatever they want to pay you. Beyond whatever they have given you in writing is your word against theirs if you have to go to the Labor Board.