Yes it is a metaphor because he does not literally have a key to her heart. It is just figurative speaking.
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I dont think this is right but I think that people should studies
Before a words is called a prefix, after is a suffix
Answer: The Value of Scripture. The value of Scripture in the life of the believer lies in its source and its function. In his exhortation to Timothy, Paul commended Scripture to Timothy by saying, “All Scripture is given by inspiration of God, and is profitable for doctrine, for reproof, for correction, for instruction in righteousness” (2 Tim. 3:16).
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