The visit

Becky's grandson and his wife are coming to visit her for the first time. So she is giving him the directions to her apartment.
"You come to the front door of the apartment building. I am in apartment number 32 on the 14th floor. At the front door, you'll see a big panel of buttons. With your elbow push button 32. I will buzz you in. Come inside, the elevator is on the right. Get in, and with your elbow hit 14. When you get out, I am on the left.  With your elbow, hit my doorbell".
"Grandma, that sounds easy, but why am I hitting all these buttons with my elbow"?
"You're coming empty handed"?