when opening a door that is stuck, there is usually the first attempt that employs the usual amount of force. then, realizing the door is stuck, there is a second attempt that quickly follows the first; this time with more force. after that, depending on the person, there are sometimes third and fourth attempts with an increasing amount of force. or, there is a step taken back, to discover why the door is stuck. and the attempt that follows, then addresses the root problem.