My iPhone want slide to unlock?

Ok I just go the update and I put on low battery mode and they want let me unlock it I don't know if low battery mode is the problem that it want unlock but please help me. It want let my get on my notifications are anything the only thing they let me do is talk to Siri and hold the power button and when i hold it all it does is say power off and it won't let my power it off.

Please help me (I'm on my sisters phone by the way )

Reset your phone by holding home and power button at the same time and see if it works

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