Check out Pine Wood Mortice Door Knob 3D model on CGTrader for $6. High-quality mesh by Polygate: 4644 polys, 4665 vertices.
OBJ (OBJ, filesize: 1.01 MB), FBX (Autodesk FBX, filesize: 1.12 MB), C4D (Cinema 4D, filesize: 1.07 MB), MAX (Autodesk 3ds Max, filesize: 5.86 MB), 3DS (3D Studio, filesize: 982 KB), MA (Autodesk Maya, filesize: 1.1 MB), MEL (Maya Mel Script, filesize: 1.1 MB), BLEND (Blender, filesize: 1.08 MB)