iPhone 4S stuck on lock screen, cannot power off because touch screen not working
My iPhone 4S touch screen is not responsive to anything, it is just stuck on the lock screen however both my lock and home button are working. The ios 7 update allows you two shortcuts on the lock screen, one at the top and one at the bottom, both of these are fully operational however anywhere in the middle of the screen doesnt work so i am unable to use my iPhone as i cannot swipe to unlock.
This just started after accidently spilling liquid onto my phone however i have checked the water indicators as advised in other forums and none of them are pink or red. I have no idea what to do next as loosing any imformation, apps, photos or music would be very very annoying and upsetting.
Any advise would be appreciated as worst case scenario would be that i cannot obtain any of my photos from my phone. I have no way of getting into it as the screen provides notifications, tells time, and shows wifi however just doesnt work. So far i have tried putting it in a tupperware of rice and near a radiator so if anyone has any information or advice that can help me it would be greatly apreccited.
iPhone 4S, iOS 7.0.4