Locking Folders without any third party software

Consider you want to lock a folder named in your E:\, whose path is E:\.
Now open the Notepad and type the following

ren .{21EC2020-3AEA-1069-A2DD-08002B30309D}

Where is your folder name. Save the text file as loc.bat in the same drive.
Open another new notepad text file and type the following

ren .{21EC2020-3AEA-1069-A2DD-08002B30309D}

Save the text file as key.bat in the same drive.
Steps to lock the folder:

To lock the folder, simply click the loc.bat and it will transform into control panel icon which is inaccessible.
To unlock the folder click the key.bat file. Thus the folder will be unlocked and the contents are accessible

PS: This is not worked fine in my system. But My Friend still arguing with me that this trick is working fine for him. So I thought Posting it here will be useful for others.