Query To check Locks on a Table

The relevant query is as follows:

Select object_id, session_id, oracle_username, os_user_name,

Process, locked_mode

From sys.v_$locked_object;

Select a.object_name, b.oracle_username

From all_objects a, v$locked_object b

Where a.object_id = b.object_id

And a.object_name like 'po%';