This clip comes from the Samsung audio library, a collection of everyday recorded effects that creators reuse for video and audio projects, and it is listed on sound effects wikis as a straightforward open door recording. Because it is clean and easy to recognise, it has spread through soundboards and editing libraries alongside door knocking, where editors need a believable door without recording one themselves. Its continued use comes from that simplicity: a single, familiar household sound that fits almost any indoor scene without distracting from dialogue or action.