iPhone in constant restart loop mode, NO JAILBREAK!

I was watching a video on YouTube, when my iPhone just simply froze. It was taking unusually long time to crash and go back to the main screen, so I decided to do hard re-fresh.

Well, that was a bad idea, because now it's in constant reset mode, where iPhone just is stuck at slide to unlock screen, then restarts, back to unlock screen, restarts, and on and on and on.

I tried to do hard reset again, but nothing is working!

From the console log, it said that springboard have crashed constantly while the slide to unlock screen.

I'm about to try full restore, but if that doesn't work, should I take my phone to the Apple Store?