Heres a trick that wont delete your pictures/videos and anything stored in sdcard0:
Turn off your device.
hold the volume up button, home button, and power button until you get to a android recovery screen.
use the volume buttons to navigate to wipe data dont worry it will only delete apps not your pictures or videos and music and stuff
after the phone restarts, you can check in a file manager (you can search for one on the appstore) you will have your pictures/videos/music there
hope this helps also you can purposly "disable" your device for 30 secs and use your google account to unlock it.