Trunk problem on 2000 Chevrolet Malibu

I went shopping and was able to pop my trunk from the inside of my car.When I came home my trunk did not want to open. I can hear it clicking when I press the button inside of my car but my trunk is not opening. I'm able to open it with a key.
Please help what could be a problem?

Asked by for the 2000 Chevrolet Malibu
needs pop actuater in the trunk