This happened about 10 years ago in my townhome in Marlton, N.J. For whatever reason, around Christmas time, my home would have more activity than the rest of the year. And apparently, it still is, as my mother still lives there and still mentions this.
Well, it was late at night and I was home from college and Christmas had just come and gone. My brother and I shared a bedroom on the second floor and we were playing some video games. And then we heard the footsteps on the stairs.
Now, after living in that townhome for a good number of years, my family and I could tell who was going up the stairs just by the weight of the person's body and how they walked. But as you have already guessed by now, it wasn't any family member and we heard it perfectly behind our closed door.
Then we heard the footsteps walk to our bedroom door and we heard the floor creaking, as if someone was standing still but were adjusting their weight from one foot to the next.
Then we saw and heard our doorknob turned and it opened slowly, with no one there!
Of course my older, stronger brother made me go out of our room to see who or what was there, but it was no use. We knew no one was there and there wasn't. Our mother was already asleep upstairs, down the hall from us and our high school-aged sister at the time was next door and she was asleep with her door closed.
Neither is likely to play tricks and if they did, they wouldn't have had the time to hide the slip second after the door opened without being seen or heard.