Yes, they can be picked, though they're generally not easy. And, if you pick the lock, be very careful not to turn the plug very far or you will find things get a bit "messy".
As to HOW to pick them? Practice practice practice.
Good tip by db, I learned that one the hard way. I have 2 KABA cam locks from some gaming machines I repaired the mother boards on as well as replaced the locks because of a missing key from an employee, luckily I was able to keep them and add them to my collection.