Frozen screen iPhone and I can't do a hard reset. What can I do?

I tried to link my Facebook in the settings today and the Facebook is stuck on verify. I can exit the settings and work the phone fine but if I go into settings all I see is the Facebook verifying screen. I can't do a hard reset because my phone's lock button is stuck. Is there anything I can do? I might need to access the settings tab. Scratch that. I just used assistive touch and went to make a new gesture by accident and it now stuck on that on the settings thing. It is unresponsive is there anything I can do please?

Added (1). I just want to clarify the entire phone still works. I can do everything as normal but when I click the settings tab I'm greeted with the create new gesture screen and before that the verifying Facebook screen. I'm currently hoping it will just sort it self out. :L

Added (2). The screen has gone back to the settings menu but is still unresponsive.

Go to those shops that help you fix the screens. They might know the answer to your problem