Why is my account locked after failed sign-ins?

The sign-in page

After several wrong passwords in a row the account locks for a while to stop guessing, and the lock lifts by itself. If you are the one who forgot, reset the password from the sign-in page; the email goes to the address on the account. If you did not try to sign in, change the password once you are in and turn on two-step sign-in.

Step by step

1. WaitThe lock lifts on its own after a short while.
2. Reset the passwordThe link on the sign-in page sends an email.
3. Check SecurityIf it was not you: change the password and switch on two-factor authentication.