I'll answer my own question here. I got a cheap "cyclone" style fan from the home store, and it works great. It is about a foot in diameter, and it pulls enough air to keep the pantry the same as ambient temperature when the chiller is running.

One thing I noticed is that the cooling actually works better with the pantry door closed. The door has about a one inch gap at the bottom. My guess is that this causes a fast stream of air for cooling vs a more radiant type of cooling.