Can a metal detector find a key?

I was about to mow the lawn and the picnic table snagged the strap of my keys. The keychain bent somehow and keys came off. Found all right there but the one to unlock my car. The grass is kind of long. I'm seriously considering going and buying a metal detector. Will a standard metal detector pick up a... show more I was about to mow the lawn and the picnic table snagged the strap of my keys. The keychain bent somehow and keys came off. Found all right there but the one to unlock my car. The grass is kind of long. I'm seriously considering going and buying a metal detector. Will a standard metal detector pick up a car key?
If so, where is the best place to get one, and can I return it already opened?
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