How to get rid of nats in my house?

OK my mom "Boyfriend" came over and he left the door open so a whole bunch of nats came in and they went in the pantry so when you open the door alll the nats are right there and its really nasty so my mom started yelling at me telling me it was my fault cuz i didnt take the trash out or sum **** like dat but all i wanna no is how do you get rid of dem