How do you initiate a hands-free call using s-voice when the phone is locked?

[Fredvsr]

I've been able to make a call using a Plantronics Legend bluetooth headset connected to my Samsung S5 as long as the screen is unlocked.  However, when the screen is locked, nothing seems to happen.  When I then unlock the screen, I can see that the S-voice app started but did not initiate the call.  Is there a setting that will allow this to work?

My company policy requires that the screen be locked with a pin so I don't have the option of disabling this feature.

[bearone21]

change your locks-screen timeout time.