[URGENT!] I cannot access my iPhone 5S due to water damage!

Hello, guys. Hm, the story of how this happened is quite simple, I obviously dropped my phone into the filled bathtub (whose water happened to contain bathbombs, foam and other products). I got it out immediately and it worked perfectly fine but the display had water underneath which left some white and grey unpleasant spots. I left my phone in rice overnight. I woke up to not much of a change, only some pixels looked dry inside the huge water mess. Sooooo, I decided several things, like restarting it, drying it with AC, with a hair dryer, with a small pump I use to clean my DSLR lens, and nothing worked, BUT my screen completely froze. I cannot tap it in any way to make it respond and some stripes appear but fade away quickly. I read that you have to restart it, so I did that, but now I cannot access it since it's asking for my passcode and I cannot type it. I really want to at least back it up but iTunes or any other software won't recognise it since it's locked. I don't really want to take it to the service. Any advice on how I can unfreeze/unlock/dry it? Oh, my home and lock buttons work perfectly fine. Thank you!