Mass user Locking and Unlocking SAP R/3 4.6

You have seen varous ways to lock / unlock users from SAP R/3 4.6x. It can be directly performed by mass change options. Please find the procedure below.

Tools --> Administration --> User Maintenance --> user (i.e. SU01)

Step 1: Select Menu Environment --> Mass Changes.
Step 2: Click "Address Data" button 
Step 3: F8 (execute) to select users to be locked.
Step 4: Select users to be locked and click "Transfer" Button.
Step 5: Click Lock / Unlock icon to lock or unlock the selected users.