How much is a key worth in dollars?

Excuse me, could you please clarify the context in which you're asking about the value of a "key" in dollars? In the world of cryptocurrency and finance, the term "key" can have multiple meanings, such as a private key for accessing a cryptocurrency wallet, a license key for software, or even a unique identifier for a digital asset. Without knowing the specific context, it's difficult to give an accurate answer. Could you please provide more information about what kind of "key" you're referring to?