Iphone 12 freezing cannot swipe??

Today, for the first time my iPhone froze as the swipe feature did not work, I tried to turn it off, but the "swipe" to turn off did not work and I didn't know the alternate was to turn it of (press volume up quickly, then press volume down quickly then on/off.) I kept checking every 15 minutes and found the the :|"swipeoff" was still flashing, I plugged it in, it was already 50% charged. about 2 hours later the swipe button was then active, nothing that i mdid. So, if i had my airline or show tickets only on my phone, I would have been out of luck!!