re: How do I get this finish, or something like it?

I do think a torch would be your best bet but you're by no means lighting on fire, just a controlled and localized charring.  Sand it back to your desired distressed look and brush on some polyurethane, lacquer or your finish of choice.  If you've got a jar of old hardware laying around, you could spread some on a hard surface like concrete and drop the board onto it a few times before firing up the torch for a truly worn look.