How can I get in to the ATC computer lab after the Library has closed?

The side entrance to duPont Library (the area with the phone booths to the left of the front doors) has a Sewanee Card accessible entrance that you use when the duPont Library is closed. Please note that the ATC lab closes 30 minutes prior to the official library closing to activate the 24/7 entrance. The lab is closed for approximately 15 minutes.