airports are rarely if ever technically closed. air traffic control tower might be closed, in which case you use common traffic advisory freq and good luck
air traffic control rarely decides to close an airport, they can act as agents to the managing authority as if they want to plow the runway for snow and close the airport.
atc may have a letter of agreement/MOU that they will declare the airport closed if CRAF has deployed to rescue/handle fire of a crash as the CRAF could then NOT respond to a second crash.
IT is however possible that the runway lights might not be on the step you wish them to be and clicking your mic on CTAF might (if equipped) change the setting.
go find a nice , competent CFII and good luck