I disagree that the "shop" would be closed. Instead of making assumptions and then stating an answer with certainty, why not just tell the truth? The answer depends on various factors, such as "blank," "blank" and "blank." Useful advice can be offered without definitively concluding something and possibly misleading the OP.
I try to be careful in my responses, but if I try to caveat every answer by all the if then and maybes each answer is the length of a magazine article. Heck, I remember an entire discussion where I even did a little research and finally came to the conclusion that the facts could not be as the OP said as it simply did not make any sense. After going around and around for days trying to get out the facts on the fourm, another poster finally asked or supposed (I don't remember which.) perhaps the poster means beneficiary and not trustee. Then, everything made sense.
For example, in this thread, what are the issues to such a statement being a crime? To write it up you have to give a full discussion on the law. How extortion was related to robbery in it's development. What constitutes a threat? Is this threat have to do with person or property? Was property actually acquired from this future threat? Was the fear the controlling cause of the victim parting with his property? Was the threat written? Was it for money or something else? Is threatening a lawsuit the same as threating to turn someone in for a crime? Is this a treat to disclose some true, but private fact which would subject him to ridicule? Is there a privilege to file a lawsuit? Was there an intent to extort or to gain? (Was the demand fair compensation?) And on and on, depending on the facts. "Without the facts there is no issue." You write the articles if you want, but that doesn't help a person any more than an answer which assumes some of the facts.
If a person could sue for abuse of process after the fact, it stands to reason that the mere threat, under the right circumstances, could be punishable as well.
Clearly you have a tort in your scenario. A crime? I don't know, maybe--if the victim is the beloved virginal daughter of the District Attorney. But then we get to reality of proof. I guess if it were videotaped with no excuse, again, maybe. But, does that maybe have any relevance to the discussion in this thread?