IPhone 5S not working after upgrading to iOS 9?

It was working for a while, then, when I went to switch apps, the screen completely froze. I can't restart it, I can't do anything. I can hit the buttons and they work, I can't switch to the homescreen when I want to. What should I do?

Maybe take it to a company to fix it that's all I could say.

Backup all you data with iTunes then restore your device to factory settings via iTunes (so it'll redownload the software) once it's done you can put your data back on (iTunes will ask you if you want to)

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