Entry door locks typically contain what type of mechanism?

Entry door locks are designed with a locking mechanism that requires a key or a method to unlock them, which primarily ensures security for the entryway. The term "locking mechanism and key" encompasses the essential components of the lock that provide this function.

A typical entry door lock will feature a mechanical mechanism that engages the locking bolt and is operated by a key. This mechanism is pivotal for maintaining the safety and security of the home, ensuring that only individuals who possess the correct key can unlock the door. This aligns with the fundamental purpose of an entry door lock — preventing unauthorized access.

In contrast, while deadbolts and spring latches are common mechanisms used in conjunction with or as part of entry door systems, they specifically describe types of locking systems rather than encompassing the broader category of "locking mechanism and key." Dummy knobs, on the other hand, serve purely as decorative hardware and do not possess any locking function at all. Hence, the most comprehensive and correct answer is "locking mechanism and key," as it accurately represents the complete unit required for the entry door's primary function of security.