@daneoleary using the august lock key pad you will NOT be able to do what you are thinking as it is a closed system so the codes only work with the lock itself. Now with a yale lock i am not sure as i don’t have one but i have seen on the forum below that if you have webcore AND a compatible lock then you could do it. You would essentially assign a code to a “user” in this case it would be the alarm as the user and then you could turn on the alarm. I would suggest that if you want to use an alarm system like abode that has an IFTTT trigger then you could use the IFTTT integration with webcore to send a command to turn on the alarm system.
or here