One of my green switches (micro-switch) had frozen stuck and wasn’t clicking (switching). I was about to pry it apart when I thought, why not try to just force it, see if it frees up? It did. I pressed down on the metal tab with my finger, levering down on that little black button. After trying that about 3 or 4 times it freed up and returned to its original state (where it clicks like its supposed to).

Try this before either giving up or committing to prying it open.