It also makes for a quick and easy way to hurt/kill things that have armor, but I imagine it would be very (very) easy to get stuck, so it’d be pretty circumstantial as a weapon, it should definitely be added as a relatively uncommon tool though.
Another way to dig tunnels and break up pavement/concrete/walls would be nice, even if it’d take way longer than with a jackhammer (I’ve used both before, a jackhammer is probably three to four times as fast and a tenth as exhausting, but a pickax is more useful to break up packed dirt when you’re digging a deep hole).
I’m not sure where it should be found, definitely possible in mines, maybe a hardware store.