How do I Scroll to over time?

so i have it where the player collides with a object and then i set the scroll to so many pixels on x...

basically i want the camera to pan over, the player gets to a point, then the camera pans over to reveal the boss.. right now i have it working but i need it to slowly scroll over instead of jumping.

here is what i have now, trying to do a lerp but its not working..any advice?

I got it working..I messed up with the collision for the camera...when the player hit this sprite, it turned on this collison on another sprite to block me from going back...and then i turned off the camera from readjusting its x to the players x...so the camera never actually collides with the Bossfightmusic, so therefore it couldnt do the actions. haha

anyway