My iphone 4, the lock button stopped working?

So my lock button stopped working and i need to know how to change the settings so that i can lock it. I'm not sure what its called but i think it is something like lock assist?

If you want it to auto-lock, go into settings>general>auto lock> and set it to what time you want

Go to settings and unblock bc. Bada aaya apple use karne wala. Beta apple sirf khane k liye labhdayak hota hai chudwane k liye nahi.

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