How do you get rid of worms in pantry?

First get rid of all food crumbs[paper liners the works.
Then wash it down with a bleach solution min of 10 percent let it dry 100 % and look for rotten wood and eggs left by by worms.
Call a exterminator and ask for the best book you can borrow from the public library to rid these from the area.
They may be living near by in walls under floor be carefull not to use a toxic chemical, This is a basic start. Do it fast as the holidays are coming up and you want it clean before you buy new food.