Oracle table Lock Unlock method

The first method:

Log in with the system account like Sys as SYSDBA

1, check the database lock, the source and type of diagnostic lock:
Select Object_id,session_id,locked_mode from V$locked_object;
or use the following command:
Select B.owner,b.object_name,l.session_id,l.locked_mode
From V$locked_object L, dba_objects b
where b.object_id=l.object_id
2. Find out the serial# of the database for killing:
Select T2.username,t2.sid,t2.serial#,t2.logon_time
From V$locked_object t1,v$session T2
where T1.session_id=t2.sid order by T2.logon_time;
3. Kill the session
Alter system kill session ' sid,serial# '

The second method:

Wait, it's said that Oracle will kill the process.