Is the door latch mechanism moving and moving far enough to release the latch to open the door,you can`t remove the the striker plate from inside a panel as the bolts that hold the plate go in from the open side of the door jam,these do have a problem with the doors coming off the rails which mean that if this is the problem then the weight of the door will hinder the door from opening you may have to hit the door hard at the latch end of the door or even pry the door open at the same end to get the latch to pop open.the latch may even be seized or just jammed closed. good luck
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