Prosperity sigil. Sigils are a low-magick technique which will not fail to get you exactly what you need. It can become a high-magick technique but for the moment we'll just stick to the basics. One important thing to note is that sigils always appear to work.
Skeleton keys have long been used as Protective Amulets and charms,due to being made of iron, through out many cultures and folk practices. They are also symbolic of opening doors-to occult knowledge, practices, unlocking mysteries, and removing blockages to your goals in life.