Check out Old Key - Rusty Iron Material MEGA PACK Low-poly 3D model on CGTrader for $6. High-quality mesh by JhoJho: 554 polys, 532 vertices. PBR, Textured, UV Mapped.
STL (Stereolithography, filesize: 305 KB), OBJ (OBJ, filesize: 391 KB), DAE (Collada, filesize: 775 KB), FBX (Autodesk FBX, filesize: 193 MB), BLEND (Blender, filesize: 1.49 MB)