IPHONE 4 button is stuck, phone will not switch on. Is it broken?

My iphone 4 button just suddenly got stuck and will not work so I used a app which allows me to switch it on and off but yesterday I tried to go on it and it was off and when I plug the charger in nothing happens. Is it broken? Or if I got the button repaired would it work again?
Thanks

Added (1). I also plugged my usb into my laptop and nothing happened.

Added (2). I have heard about holding down the power button and the home key, but for me its impossible as the on/off button is stuck.

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I got my iphone 5c last week and i just spilled water on the corner of it so you can see like the water trapped in the corner of the phone under the screen. It still works though but you can see the water bubble. I just put it in rice but how long should i leave it in there for? Will 3 hours be enough? And if the phone works now with water inside it, does that mean it will continue to work or could it just pack up at any time?

Added (1). I just realised that there was no water buble, it was just my background haha so now everything works and i can't see any water, does that mean it is okay?

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