Each building on campus has a person assigned to report facility-related issues for repair and maintenance (e.g., door does not lock, window is broken, water leak, flickering light, occupancy sensor turns off when room is occupied, electrical circuit is out). BMR lookup: http://fmo.unl.edu/bmr/lookup.
If the problem is an after-hours emergency, dial 0 from a University phone (there is one located in the tower lobby) for the University Operator and leave a call-back number where the service personnel can reach you for additional information.
Hardin Hall's exterior doors and hallway doors are unlocked from 7:30 a.m. - 5:30 p.m. Monday through Friday. They are locked evenings, weekends, and University Holidays.
Door schedules are adjusted to accommodate evening classes and events.