Whoever enters or attempts to enter any bank, credit union, or any savings and loan association, or any building used in whole or in part as a bank, credit union, or as a savings and loan association, with intent to commit in such bank, credit union, or in such savings and loan association, or building, or part thereof, so used, any felony affecting such bank, credit union, or such savings and loan association and in violation of any statute of the United States, or any larceny—

Shall be fined under this title or imprisoned not more than twenty years, or both.