How to find/kill the locked objects in an oracle database

The below query can be used for determining the if any object locked in an oracle database.

select   c.owner,  c.object_name,  c.object_type,  b.sid,  b.serial#,
   b.status, b.osuser, b.machine
from
   v$locked_object a , v$session b, dba_objects c
where
   b.sid = a.session_id
and a.object_id = c.object_id;

And if you need to kill any session you can use the below query to do the same.

alter system kill session sid,serial;