Frozen iPhone wont unlock

For the past hour my Iphone 5 has not been able to unlock. When i try to swipe the screen to type in my passcode, it freezes until the black apple screen logo comes up and turns back on then it repeats with the frozen screen

For about 10 minutes i could use siri to call people but that no longer works

ive tried holding down the lock button and the home button, but for the past year my lock button has been broken

I have no idea what to do.