My phone auto locks after 30 seconds, but auto lock is greyed out- why can't I change it?

[iMore Question]

iPhone 5s. Went to settings- display. Can see the auto lock setting, but it is greyed out and won't be clicked on or changed

 

[erichards2]

Do you have some kind of restrictions set that you need to disable before changing these settings?

 

[Tartarus]

Disable Low Power Mode in Settings > Battery

 

[KevinandCam2010]

Thanks

Disable Low Power Mode in Settings > Battery

Thanks, Tartarus. I appreciate your quick and CORRECT abswer to the problem mentioned. Have a great weekend!:thinking: