A slightly different door stuck thread

[UPGrayd]

Originally Posted by andrewwynn

The lock button is one way. Internally it's spring loaded and only locks.

When the door won't latch it's almost always because one of the handle levers to the door lock actuator are stuck in the open position.

Example; one drop of water will freeze the mechanism; if you force it open, the ice is still there and holds the lever "unlatched" and the door will not latch until you defrost the DLA. Door handle carrier cable corrosion can cause the caller l cable to effectively shrink and cause the same symptom.

So im assuming corrosion on the mechanism caused it to bind in the unlatched position(we dont have freezing issues here in Sunny NSW, Australia in the spring time). Given I managed to get it to latch by closing the door enthusiastically, What would likely be causing it to not unlatch when using either handle now?