Door catch problem

I have a 1993 buick lesabre with the door catch tripped. It will not release or open. Tried holding door handle open and releasing but will not. Any suggestions? Thank you in advance,Terry

Well i finally got it to unlatch. I tripped something from inside the door and got it opened up. The customers daughter had something bent on the inside and had also knocked the rod to the outer door handle off the latch mechanism. A good reason to call a locksmith when you lock the keys inside. Thanks Terry