Try this as well

gistfile1.txt

unlock HR, Scott etc. users in Oracle Database 12c.

Step 1: 
 C:\>  sqlplus /  as  sysdba
 SQL> SHOW  con_name
 SQL> SELECT  name,  con_id  FROM  v$pdbs;
 SQL> SELECT  name  FROM  v$active_services  WHERE  con_id = 3;

Step 2: Update tnsname.ora file

PDBORCL =
  (DESCRIPTION =
   (ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
   (CONNECT_DATA =
    (SERVER = DEDICATED)
    (SERVICE_NAME = pdborcl)
   )
  )

Step3: Switch the container from CBD$ROOT to PDBORCL
 C:\>  sqlplus  /  as  sysdba
 SQL>  ALTER  SESSION  SET  CONTAINER  =  pdborcl;
 SQL>  SHOW  con_name;

Step 4: Open the pluggable database PDBORCL
 SQL>  SELECT  name,  open_mode  FROM  v$pdbs;
 SQL>  ALTER  PLUGGABLE  DATABASE  open;

Step 5: Unlock the HR user
 SQL> ALTER  USER  hr  IDENTIFIED  BY  hr  ACCOUNT  unlock;

Step 6: Log in to your database using HR user
 SQL>  conn  hr/hr  @pdborcl;