For this situation, you would need to connect your iPhone 7 to a computer with iTunes and either erase the phone through iTunes or enter recovery mode through iTunes. If you don’t have a computer, you can either borrow one from someone you know or visit an Apple store. In order to avoid this situation in the future, are you aware of Touch ID? Your iPhone is capable of being unlocked nearly instantly using your daughter’s thumbprint. You can’t forget your thumbprint!