IPhone lock button broken. Can turn off but how do i turn it on?

The lock button at the top of my iphone is broken, but i have been using it fine as i have turned on 'Assistive Touch' and have been using the white dot that appears on screen.
However, I'm worried about turning it off, and surely the white dot will disappeaer when the phone is off, and I will have no way of turning it on?

Am I correct in thinking this?

Reset it

Best to get it repaired if you just recently bought it and still under apple warranty.

Blow a can of compressed air around your lock button and it might blow our dust if it's blocking it. Mine stopped working and after I did that it worked again.

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