JanadeNolah Asked: I Heard Footsteeps In My Kitchen When Me And My Friend Where In The LivingRoom?

Okay so me and my friend were watching T.V this morning and we heard footsteps coming from the kitchen, the door was closed and the kitchen is right next to the living room, I think my dog herd it to because she rushed over to the door and stood their like she wanted down to the kitchen. I ran over to but the slide lock on the door but about 15 mins later I opend and cheeked the kitchen to see if their was an intruder but there was nothing there. So me and my friend thought everything was back to normal we went ad played Zumba and about 20 mins into playing it my friend saw the handle push up and the door opened slightly, also no windows were open so there was no wind about, we were very freaked out could their be a reasonable explanation to this, thanks for any answers.