I have a sliding pantry in the kitchen area, I attach two pics. For the last two years since I bought it, the shelves have slid in and out just fine. We moved two weeks ago; I didn't touch the shelves, just shut the door. When we arrived, the shelves were stuck in place. If I yank on them, I can tell it's stuck at the bottom front corner. I've picked around that point with every tool I can think of and it won't budge, and I can't tell why. Does the forum have any magic for me? Thanks all!