picking techniques that create vibration are based upon essentially the same idea: creating a momentary gap between the lower tumblers and drivers.
Electric picks provide a focused shock to all of the pins at the same time. That energy is transferred to the driver pins which, for a short time, are driven above shear line. If torque is applied at the right moment, then there is a window of time when all bottom pins are in the plug, and all driver pins are in the shell. At that moment, there is nothing to keep the plug from rotating, and the lock can be opened.

For the best book out there on high security locks and their operation, take a look at amazon.com for High-Security Mechanical Locks An Encyclopedic Reference. Written by our very own site member Greyman! A true 5 Star read!!