How do i rig a pressure switch?

i am trying to make a burglar alarm for my room so my mom won't come into my room all the time. I am doing it with with some alligator clips on wires, a red light fixture, a buzzer, 2 batteries, and 2 pressure switches. i know how to do the light thing. i bought the kind of pressure swith that doesn't stay open on its own. i got it so the buzzer goes on when i'm not pushing it and when i am pushing it nothing happens what do i do?