About iPhone 3gs Update 6.1.6?

I just updated my iPhone 3GS to 6.1.6 this morning and after that my sleep button won't work. Is that because of the update?

Do not think so, normally updating should not affect in any way that, anyway can try and do a factory rest if still not working probably need to fix the button

Don't see how a software update could mess up a hardware button. Try restarting & see if that helps.