There is not in Florida law a specific prohibiting against such employment.
In order to be employed, you have to have a license.
To get the license, you can by law be excluded for any reason, but in particular the following:
d) The division may deny, declare ineligible, or revoke any card room occupational license if the applicant or holder thereof has been found guilty or had adjudication withheld in this state or any other state, or under the laws of the United States of a felony or misdemeanor involving forgery, larceny, extortion, conspiracy to defraud, or filing false reports to a government agency, racing or gaming commission or authority.
The gaming board has the ultimate say in which a person gets a license. They are not bound to being less stringent than this law. You may find that you will not get a license if you have been convicted of any felony at all. They can be more strict, but not less strict.