hello Lauren,
keeping your iPhone in rice is the worst you can do. Contrary to appearances and opinions of "home-grown scientists from the YT era", rice maintains a humid environment with a specific PH, helping to ionize the environment and thus (due to the connected battery) it really enhances the course of copper corrosion.
Take the iPhone out of the rice, rinse it under a lukewarm stream of tap water (yes, douse it with water) - very lightly, keeping the charging port down. Then put your wet iPhone away with the charging port down (vertically) in a ventilated place (away from the heated window) so that the water drips or evaporates from the inside. In the meantime, find a good repair shop that will open your iPhone and verify any potential damage. If you bought it at an Apple showroom and no one has opened it before, there's a good chance your phone will come back to life quickly (after checking and a light cleaning).