iPhone won’t turn back on

i left my iPhone 11 in my bag while I was at the beach. No water got to it except for maybe a little bit from my fingers but not enough to cause any water damage. When I went on it, it said “no SIM card installed” so I turned off the phone by holding down the power button. Now it won’t turn back on, I’ve tried charging it but nothing comes up on the screen, connecting it to iTunes but it doesn’t connect, pressing the volume buttons then the power buttons etc. When I held the volume buttons and power button together it turned on for a couple of seconds, was really laggy and the volume bar kept coming up on the screen even though I wasn’t touching the volume buttons. Then it turned off by itself and won’t turn back on again.