Locked out of old iPhone SE and iPhone 7

I have a couple of older iphones that I have been meaning to pass on or possibly sell-they have been gathering dust in my drawer for some time. I recently restored them to default settings for future use and possibly to use as an emergency phone.

I was hoping to pass on one of the phones to my younger son, but when I went to set them up it appears both have been locked out with a passcode "try again in 8hrs" with timestamps in the early hours.

Turns out my teenage daughter (who has an iphone and screentime/restrictions through family settings) had snuck in to our bedroom and attempted to use them in the middle of the night, hoping to gain unrestricted access to apps/web content (a warning to all parents of tweens/teens out there-hide/get rid of old phones!). When confronted, she admitted her attempts but did not really know what she was doing-and now I have two locked out phones as she cannot remember the passcodes she set up.

Any tips to resolve at home or is it a genius bar job?

Thanks,

Jeff

[Re-Titled by Moderator]

Original Title: Locked out of old iphones (iphone SE/iphone 7)