(a) Upon conviction of the criminal offense of "pharmacy robbery" as defined in Section 13A-8-51(2), the offender shall be imprisoned at hard labor for not less than 10 years nor more than 99 years and shall be ineligible for consideration for parole, probation or suspension of sentence.
(b) On a second or subsequent conviction under this article, the offender shall be imprisoned for the remainder of his natural life and shall be ineligible for consideration for parole, probation or suspension of sentence.