Can't turn off clicking lock, unlock sound

[Mr Lebowski]

I've turned off every notification sound but I can turn off the
annoying clicks every time the screen times out or I lock or unlock it !
I can turn it down with the ringer, but I want if off.
Play a sounds for: Lock and unlock isn't checked.
Help ! :angry:

 

[oldpueblo]

Settings, ringtones and sounds, scroll down.

 

[Mr Lebowski]

Settings, ringtones and sounds, scroll down.

I know I mentioned that above, Play a sounds for: Lock and unlocked isn't checked (enabled)
but thanks anyway.
I had to soft set it several times for the [ ] Lock and unlock uncheck box to work.