“Easy” is in the name. The Lockey M210DC EZ Double Sided Keyless Deadbolt Lock securely locks the door from the inside also with its two-sided keypad. Entry doors with glass sidelights, families with special needs children, or seniors who may be prone to wandering, can benefit from the utility of double sided keyless locks. Better than an ordinary two-sided deadbolt, this one doesn’t need a key.