I cannot swipe to unlock my iPhone 4S screen

I was texting in class and a couple minutes later when I went to unlock my phone it wouldn't let me swipe. I thought, no big deal, I wiped the screen off and tried again, still no response. I started to panic, I removed my case and screen protector and still could not swipe to bring up the screen to unlock my phone. The odd thing is on my lock screen I can swipe down to bring up the notifications and swipe up from the bottom to bring up the utilities. I also found it strange that when I used Siri to make a call I could press the speakerphone and keypad buttons. During the call I tried to press contacts, this brought me to the screen to unlock my phone (finally!) but it wouldn't let me press any of the numbers! It's been like this for an hour. Soon I'm going to let it die and leave it off for like an hour and see if that helps, if it doesn't could someone please try and help!!!!