Power button on headphones not working?

I turned off my headphones (JBL T450BT idk how much that helps though) and then I tried turning it back on. It wouldn’t turn on unless I pressed really hard on the power button, and that worked. However, I wanted to make sure that pressing hard actually worked, so I turned it back off again. This time, it wouldn’t turn on again. I tried fully charging it, but it just wouldn’t turn on. The power button has a different sound when it’s being pushed now.