R.L.
I hope I don't get too much slack from what Im about to say...we moved my 2yo to a big girl bed just before my little one arrived. Had the same problem with her getting out of her bed and coming to the living room over and over. I finally just shut the door, she then learned to open it so I put a child safety thingy on the inside...yes I know sounds terrible but it worked...after several nights of her sitting at the door trying to open, crying and then later falling asleep on the floor, she finally gave up. After she would fall asleep we would return to her room, put her in her bed if necessary, and leave her door cracked so that if she got up at night she could still come to our room.
Now, to keep her in bed, we tell her we'll leave the door open if she stays in bed but if she gets out of her bed, we'll have to shut the door...she stays in bed! Do know we're just now getting to this point after months of the other so it will take time and patience but it's worth it.