School Security Locks for K-12 Facilities Schools deserve proper security solutions that don’t break the budget. The consultative experts at ASSA ABLOY DSS are on-hand to help you find the right solutions for your K-12 facility. SARGENT Harmony Big features in a small, well-styled lock. Designed to blend into any environment flawlessly, Harmony is in tune with the aesthetic needs of the architect, and provides high security for the facility manager. SARGENT 80 Series 56-Exit Device The Electric Latch Retraction exit device from SARGENT provides remote-controlled latch retraction for high traffic egress doors, and delivers quiet, smooth operation.