Will every lock yield to lockpicking?
Eventually, every lock, if worked on long enough by a qualified and skillful lockpicker, would yield. However, there are high security models that are as close to being pick-proof imagineable. Some of these locks are not worth wasting time on if you want to pick them because the odds of success are astronomically low. The good thing for locksmiths is that these brands, such as Medeco and Abloy, are not found often and are virtually never used in residential homes. You’ll find them in government and military installations and banks. This leaves about 90% of the locks on planet Earth vulnerable to the skills of a practiced lockpicker.