The Simplex 7100 series light commercial / residential lock features a sleek and robust design and auto-locking, deadlatch (or rim latch) security.  You can use this as a primary or auxiliary lock in residential or small office applications.  The rugged all-metal construction is weather resistant, providing added strength and durability.  Made by dormakaba who has been designing push-button security locks for decades.  Their hardware is first-class and will endure years of use and weather.