Door Latch broke/stuck

My 1964 Buick Skylark Convertible, yesterday I could not get the passenger door open. Both inside and outside handles will let door open
about 1/4 inch, but will not open the latch all the way. Sprayed down thru the window slot with WD40. Nothing. Removed inner door panel
and more lube, have tried to trip the latch from inside the door, but no luck.
ANY IDEAS HOW TO GET DOOR OPEN ??
 
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