"but what if they don't or they claim to have forgotten their password etc?" How do you manage this kind of use case in your normal operation? Does it mean tha

"but what if they don't or they claim to have forgotten their password etc?" How do you manage this kind of use case in your normal operation? Does it mean that if you cannot reset your password your account is locked forever? If not how is this process less valid to answer a GDPR request?