If true yes that would come under false imprisonment. Though it does say in that link that he used a stunt double anyway. Also I have to ask if they were alone in a room together how do other people know what was said? My opinion he never said "I'll destroy your career." Besides being wrong, that would just be too risky. I thought Ray Fisher had already retracted his statement anyway?Isn't locking someone in a room considered false imprisonment?
I honestly don't know. If someone is just being an immature jerk or prankster (and lasted less than 5 minutes), I wouldn't want them to go to jail for it, but if she was locked in there "until she saw reason" (especially for several minutes or longer) or used as a way to menace her (Joss claiming to make some phone calls to sabotage any attempt by her to file a complaint or seek justice) that seems like something that should be prosecuted (or at least investigated).