How to unlock my iPad without a computer

Visit an Apple Store or Authorized Apple Service Center and seek assistance there.

You can also borrow a friend's computer if that would be an option for you.

https://support.apple.com/en-us/HT204306

Borrowing someone’s computer is not a good idea. That would invite tremendous confusion about Apple IDs, whose backup belongs where, and whose purchases belong where.

Avoid this approach.