How to reboot my phone
My screen froze and my power button doesn't work how can I fix it
苹果 iPhone 5s 于2013年9月10日公布。该设备的维修与以前的型号相似，需要螺丝刀和撬棒。可使用GSM或CDMA / 16、32或64 GB。颜色有银色、金色和太空灰。
If the power button is damaged you have no way of doing this without taking apart the phone. Follow this guide, all you need to do is remove the battery connection then reconnect it again, plug it into the charger and it will boot up.
The phone becomes quite hard to operate when the On / Off button is not working so get that repaired as soon as possible
Best of luck