How to implement the generation of temporary passwords?

Question

Passwords

Faced with the following problem. If the password is lost, the user must be given the opportunity to recover the data. The password must be sent to your e-mail or phone number. The password must consist of lowercase and uppercase Latin letters and Arabic numerals. The password should only exist until the user recovers the data within 15 minutes. The password should not be dependent on any user data (for example, on the length of the login)