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There are many different modern door lock designs available, but most can be categorized into a few basic types:

Deadbolt lock: This type of lock is often used as a secondary lock in addition to a knob or lever lock. Deadbolt locks are typically installed on the top of a door and extend into the door frame to provide additional security.

Knob or lever lock: These locks are commonly used on interior doors, such as bedrooms and bathrooms. They are often less secure than deadbolt locks and are typically easier to pick or bypass.

Smart lock: A smart lock is an electronic lock that can be controlled via a smartphone app or other internet-connected device. Smart locks may use a variety of locking mechanisms, including deadbolts or latch bolts.

Padlock: A padlock is a portable lock that can be used to secure doors, gates, or other items. They typically have a shackle that can be locked in place using a key, combination, or other locking mechanism.

Mortise lock: A mortise lock is a type of lock that is embedded within the door itself. Mortise locks are often used on exterior doors and are typically more secure than knob or lever locks.

Combination lock: A combination lock uses a series of numbers or letters to unlock the door. Combination locks are often used on safes, lockers, and other secure storage containers.

The design of a door lock will depend on the specific type of lock and the level of security required. When selecting a door lock, it's important to consider factors such as ease of use, durability, and level of security.