I'm also noticed he does it more after I clip his nails you think the clip his nails so he doesn't ruin the furniture and then he starts I guess "sharpening" them back up on the toilet paper and paper towels.
(1) Urinate on or near the boxes of kleenex or toilet paper. That's what I did. It marks your territory and keeps him away....I'm joking :)
(2) Get some child proof cupboard locks. Any home improvement store should have them. You have to use your fingers at the top of the cupboard to press down and unlatch the plastic tab.
(3) Squirt kitty with a water bottle if/when you catch him in the act.
(4) Motion detector alarm - lol, sort of joking. I had one years ago that if an object is moved (i.e. the door) it sets off a high pitched alarm. It was very inexpensive and I used to attach it to my backpack when I went travelling overseas and staying in questionable areas.