a memory I vividly remember

One time when I was like 6 my mom and dad went to the store and I stayed home with my brothers playing skate 3 and we fell asleep a few hours later, I thought I heard my mom and dad talking outside in the living room so I peeked my head out and was confused as to why I heard people talking when the living room was dark and empty so I brushed it off and I remember VERY clearly me CLOSING and LOCKING the door then turning back around to go back to sleep and hearing the door open so I run to one of my brothers waking them up and I start explaining what happened and they told me it was just my imagination im 15 now and I still that about it and it creeps me out.