Help with pigeon please!! emergency?

I found a baby pigeon, it flaps its wings and tries to fly so it must be around 20 days old. But it wont eat anything! Its scared of me and tries to run. I gave it bird food + whatever birds eat and it wont even open its mouth! The stupid thing wont even peck at anything! How can I get it to eat something? It has near full feathers (still has that yellow fur on its neck area).