If you've shopped during lunch, then take your full bag back to your office and either put it in the company fridge or put it away in your space. Most fruits and vegetables don't need to be refrigerated, though you might want to air them out (take them out of the bag). But obviously cheeses, meats and yogurts definitely need to be refrigerated. If your office doesn't have a fridge, take up a collection or ask the boss to invest in a small one. They're fairly cheap. Or buy one for yourself.
If you bought herbs like basil or cilantro and you keep them near your desk, your office will smell wonderful for the rest of the day. The pleasing aroma will make everyone who comes into your office bend to your will.
Then get back to work.