When you click to unlock your account and enter your password, you will find that your password has expired and the words iPhone/iPad will appear on the screen, which is "Lost Mode". If you want to unlock and activate your phone, apparently you can only add QQ displayed on the screen and spend a few hundred yuan to unlock it. In fact, if you have the purchase voucher for the Apple device, such as a formal invoice, you can go to an Apple authorized after-sales service center and use the purchase voucher to seek help from Apple after-sales personnel to unlock it.
Reference materials
Apple ID is locked, what should I do if my Apple ID is locked? .Baidu Experience [cited on 2018-5-1]