Successfully imported Data Constructor not in scope?

What is going on here? I'm importing a data constructor, apparently successfully because I don't get an error, but when I try to use the constructor, I get an error saying its not in scope!

In Test.hs:

import Database.Persist (Key)

main = Key

Result:

$ ghc test.hs
[1 of 1] Compiling Main             ( test.hs, test.o )

test.hs:3:8: Not in scope: data constructor `Key'