iPhone won't unlock
Hi, my iPhone 11 lock screen background has gone black and now won't let me unlock my phone. I have tried to restart it but every time I get the option to turn it off it won't let me swipe to turn it off, only letting me move the options of the emergency button or SOS call. I can sometimes get the pin to unlock to come up but when I enter my pin it doesn't open up my phone just stays on my slock screen and lets me see my messages. I have then tried to get in by tapping on my messages but it just clears them from the screen. any help would be appreciated as my diary/plans on it and I am at a loss without it.
iPhone 11, iOS 15