How to unlock an oracle user lock (ORA-28000: the account is locked:

How to unlock an oracle user lock (ORA-28000: the account is locked:
When using Oracle databases, users are often locked. Take Scott as an example. solution:
Step 1: Log On As an administrator: sqlplus sys/system as sysdba;
Step 2: After Successful Logon, run alter user Scott account unlock;
Step 3: after entering the original password, the (ORA-28001: the password has expired) error may occur, it does not matter, modify the Database Password, operation method:
Log on as an administrator and enter alter user "Scott" identified by "Scott ";
The above three steps can solve the problem.