Vintage Key Simplistic Modern Aesthetic Replace

Design a vintage key with a more simplistic, modern aesthetic. Replace the ornamental head with a sleek, geometric shape, and change the flower motif to a subtle swirl pattern. Remove any decorative vines hanging from the key. The shaft should have a brushed metal finish instead of a wood-like texture, and the overall color scheme should be a monochromatic palette, perhaps in shades of gray or black. The background can feature a soft gradient to highlight the key without any branding elements.