How do i get my Labrador from stealing?

We own 4 labrador dogs , and one and only one will steal food at every opportunity. he will open the cupboards, the bin and even the fridge. We hav eput weights on the bin and secured most of the cupboards but he always does it after we leave the room. Aside from shooting him ( joke) what can we do to stop this .....I mean stop him rather than creating Fort Knox in the kitchen