Unable to delete anything on iPhone as fingerprint won't work

Im trying to delete everything from my phone but it says i need to use my fingerprint for that. The thing is that my fingerprint has not worked for a long time anymore because i dont really have a print on that finger anymore since im 81 years old. to remove the fingerprint i also have to use my fingerprint. Can someone help me with this because i dont know what to do.

[Re-Titled by Moderator]