The frozen latch reminds you that access depends on small ordinary things working.

Getting into a building rests on a chain of unremarkable parts, and a latch stiff with ice is enough to break it. Most of the time none of that machinery is visible, which is why it is easy to think of access as a general fact rather than a set of hinges, ramps, batteries and handles that someone maintains. Anyone who has been locked out by a small failure knows how quickly the ordinary becomes decisive.

Check the small things near you before the cold sets in properly. Oil the hinge, replace the dim bulb, clear the step. Those are the parts that quietly decide who gets in.