US Patent 11447975 Lock system with key and auxiliary pin tumbler stack

Locking systems allow for the unlocking and locking of, e.g., doors, containers, and enclosures. Lock cylinders are coded to specific keys, and often there is a desire to have a key be able to access a subset of lock cylinders. Keys are coded using bitting to gain access to specific lock cylinders. It is with respect to these and other general considerations that embodiments have been described.