I've locked mine in mine several times. MOstly right after I bought it. I was use to having keypad on the door and this one dosen't have that. Luckily wife has a spare key and FOB for mine so I have had to call her and have her come unlock my truck for me.
The locks on the sliding back glass on these are better than the ones on the early 90's S-10's. The one I had all I had to do was put my right plam flat on the glass and push while bumping the frame with the soft side of my fist and it would slide open. By the third time I did it I could get it open with one bump.
Lost about 200 CD's because somebody else apperently knew this while I was at work one night. Came out of work and my back glass was open, Cd's were gone. Of coarse back then we didn't have burners so it was all store bought cd's. About $3000 worth!