how to fix iphone 5 lock button after water damage?

So earlier today I had dropped my iphone 5 into the toliet. Now I had just peed in the toliet.. and I grabbed the phone out asap. It was in there no longer then 2 seconds. I pulled it out, dried it off and it turned on. The only problem it had was the speakers didnt work but I found out that if you put a q tip in the headphone jack thatll fix it. So I fixed that and everything seemed to be working good. Then after about an hour I notice when I push the lock the response was delayed.. it took about 2 seconds after I hit the button for it to turn off. Then later it just totally stopped working. I cant turn on or off my iphone with using the power button on the top. Well I turned it off by going into the settings now I have it in rice. Anyone know how I can fix this? Will the rice work or is it just pretty much dead? what can I do? Thanks.