Forgot to turn on lights autoflowers

You will be fine. But buy a timer lol

Leaving the lights off is not great since the plant missed some light, but it is not really harmful. Go buy a timer so you don't have to manually turn the light on and off.

No, not with autoflowers. Autoflowers do not go by any light hour schedules. The more they get the better. Even if it was photoperiods, to alter a schedule it would have to be longer then 1 day for it to start effecting a plant. In your case with the autos. You just lost some grow time. Very minor. Plants like rest as well. Happy growing. Good luck. Enjoy the harvest soon.

No, it's not going to harm a thing... no worries! They're probably a little confused but you've done absolutely no harm at all... Good luck!