Use a night latch, also known as a night latch lock or rim latch, as a secondary security measure on residential or commercial doors. They provide an additional layer of protection and are often used on entrance doors, particularly in residential settings. It is typically mounted on the internal surface of the door rather than being embedded within it, making it easy to install and suitable for various door types. Night latches are commonly used in conjunction with other types of locks, such as deadbolts, for enhanced security. Use the key supplied to lock or unlock from the outside and the snib or latch holdback button inside to keep the door open.