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The hardest lock out there to pick are master locks. They offer an excellent protection system, and aren't as susceptible to picking as other types of locks. Master locks were invented by Henry Soref in 1921, introducing the first lock to use laminated layers of solid steel. Although master locks use the same picking system as other types of locks, those that are in combined format will require a locksmith with a lot of patience - and skill.
To learn more about lock picking, there are several books and illustrations that you can buy, which will show you the techniques step by step. Often times, a video or Cd is included that will show you the techniques in action. Several books and videos were made by true locksmiths, although others are more directed for people who just want to learn a bit more on the subject. If you want to become a locksmith or a professional at lock picking, you can also find books and videos out there that will help you become proficient at picking locks.
Anytime you buy a lock, you should always keep in mind that just about any lock can be picked. Although most locks can be picked, there are some that take a bit more time and patience than others. When you buy a lock, you should always think in terms of safety and select one that you know it isn't to penetrate. This way, you can have a sense of security in your lock - and know that you are safe and protected.