From what I am reading you do have the same pantry as I do. Mine is on the street side of the trailer on the right of a cabinet that is to the right of the refrigerator. The Safari has a push button handle that when pushed in locks the drawer/door. Pushed a second time it pops out and the button acts as a pull.
I have twin beds in the rear and a drawer cabinet between the two. On our first big trip out the drawer slid out and fell to the floor bending the rails. Thankfully I was stopping at Jackson Center anyway so I picked up replacement rails. The problem on my end was the bed cover had slightly been pulled into the drawer sides, unnoticed by me. I had the button pushed in and locked but the latch did not engage the strike plate.
My thoughts on your end is more or less either the latch/lock assembly or striker plate which is not adjusted correctly. You might want to see if you can slide either assembly to better engage. You are still under warranty so you should be able to get this problem corrected.....assuming you have a dealer within reasonable drive. The problem could also be that the lock assembly is defective and not extending properly when in the locked position.
Since every drawer and door assembly uses the same lock assembly, I bought a spare when at Jackson Center. I figured if a lock broke while out on the road, duct tape would be the only solution in keeping things closed. The spare lock gives me peace of mind and a quick fix without the mess of tape. You can just purchase the lock/latch component, without buying all the other hardware like the push/pull button and striker plate.
'04 Classic 30' S.O.,'03 GMC Savana 2500,'14 Honda CTX 700