How do I change the lock screen sound effect on my Samsung Galaxy S4 5.0.1?

[AC Question]

How to change lock screen sound effect on Samsung Galaxy S4 5.0.1

I would like to know how to change the unlocking/locking sound on my Samsung Galaxy S4, android version 5.0.1. Please notice that I do not want to have customized sounds, I just want to access the "original" sounds.

If anyone knows how to do this, please post a comment.

Thank you!