This discussion was incredibly helpful to me, particularly the part where it said the latch is not deep in. Still, I was unable to get the latch to operate until I used an idea from another thread on this subject. I used an icing spreader, which has a thin stainless piece of metal on a wooden handle. It isn’t sharp, and has a rounded end. It was thin enough to go in the gap, and stiff and strong enough to move the latch.