PAY GRADE: Aux 2. PRIMARY PURPOSE: The Night Lock-Up Custodian, under general supervision of the Building Operator, the Custodian, cleans and maintains offices, halls, classrooms and similar areas in a school building; secures the building upon closing and performs related work as required or assigned. Type of Equipment Used: Vacuum cleaner, broom, dust mop, wet mop, bucket, wringer, spray bottles, high duster, cart, small hand tools, roto and extractor.