The solution is to store your money on a wallet where you do not have the private key. This way if you cannot access your funds nobody will be able to coerce you.
In that case the obvious move from the 5$ wrench perspective is to hit you with it until you tell them where the private key is kept, because you would need to have it somewhere.
The key must exist somewhere and the wrench may make you reveal that information instead.
What 5 dollar wrench wielder is going to believe that, even when it's true?
Their solution to that is "rot in jail for a long time, then".
https://en.wikipedia.org/wiki/H._Beatty_Chadwick