iPhone security lockout

Unfortunately, it’s too late for that.

Your only option is to reset the device (completely erasing it) and restoring from a backup.

You WILL need your AppleID credentials.

See:

How to remove your iPhone, iPad or iPod touch passcode without a computer – Apple Support (AU)

Note that if your iOS is earlier than 15.2, you’ll additionally need a cable and computer to follow the steps linked at the bottom of the article.

Going forward, suggest you consider using Guided Access before handing an unlocked iPhone to anyone.

Use Guided Access with iPhone, iPad, and iPod touch - Apple Support

Hello, to remove security lockout go onto a mac and connect you're phone via cable. Then a prompt should pop up asking if you want to restore you're device. However if this is not a option you'll need to erase it and juse a backup to restore data.