I actually have some radio control servos kicking around the house. I bet even those little ones have enough power to actuate the grill. I'm not sure about holding it in place... but we'll see. I can design it so the wind speed holds it shut. I like the servo idea though. Also, I looked on amazon and you can get 2X micro servos for about $8. Its WAY smaller than the door lock actuator and would be much easier to integrate into the design. Thanks for the idea!
https://www.amazon.com/TowerPro-SG90...ds=micro+servo