IPhone 4 Broken and Instagram took over AGH?

My iPhone 4 isn't responsive to the home button, it won't close Instagram! My lock button works but won't let me turn it off, or close the app! It's an iPhone 4 with iOS 7 beta 4!

Call Apple, or wait until your battery dies and then try turning it on again. Sounds like its just frozen. The app may crash.

Turn your phone off and turn it back on.

Is your iPhone's UDID registered? A lot of people have been reporting problems with iOS 7 if they run it on a device that hasn't been registered with a developer account through a site like http://www.udid.in/. I registered my 4S there and I haven't had any problems.