Last Shot

Does the last shot feature work? I haven't had much success when I try to use it...I often try to use it after a stoppage when game clock is under 30 seconds but my guys will typically fire up shots with 12, 16, 18 seconds left on the clock. I've played around with slowing down my offensive tempo to 2 or 3 or 4 in addition to checking the box for "last shot" but haven't had much luck. I can understand it not working every single time but I'm having trouble executing it even once...just wondering what others are experiencing? Thanks in advance and great game!