I dropped my phone (S6) in the toilet for a second, but the back button won't work...

A

AC Question

So, I dropped my phone in the toilet for a second, it fell bottom first in and I took it out in a second. The water didn't touch the camera nor the top side of the phone and never got to the sim. I immediately dried it, took out the sim, turned it off and a min later I put it in a container full of rice and enclosed it. Before I did this, I checked the phone if it would turn on, and it did, but the only thing that didn't work was the back button. The volume, speakers, home button, and open apps button were all working. If you know how to fix this or what I should do next if the problem persists please let me know. Thanks!