My iPhone 5c will NOT turn off

When I click the lock button the phone goes black for ONE second, and then the lock screen lights up, and does NOT turn off. Like EVER. I cheched my setting to see if the auto-lock was on, and it was. My phone dies so quickly because of this.
it IS jail broke.
someone Please help me.

Shouldn't have jailbroken it

My Iphone 5c will not turn off… Help