My Chequers would use a completely different approach. He'd simply give me his miaow (which is loud enough to wake the entire street) that says "I know that there's food about and I want it NOW! Get it sorted, Human!"
I put child proof locks on cupboards to keep Frankie out. H had no problem with them, I couldn't get the doors to open.
Chris,
Once his monster gets the door opened his work will be done. He will then try the approach that Chequers prefers. (I had a bit of a problem typing hat sentence without tackling the apostrophe issue Chequers' or Chequers's)!