Shopkeepers have the right to use force to prevent theft of product. If you respond with violence (which they did - the three of them were beating on the bakery employee when the cops rolled up), then that is strong arm robbery
(A) No person, in attempting or committing a theft offense or in fleeing immediately after the attempt or offense, shall do any of the following:
(1) Have a deadly weapon on or about the offender's person or under the offender's control;
(2) Inflict, attempt to inflict, or threaten to inflict physical harm on another;
(3) Use or threaten the immediate use of force against another.
(B) Whoever violates this section is guilty of robbery. A violation of division (A)(1) or (2) of this section is a felony of the second degree. A violation of division (A)(3) of this section is a felony of the third degree.
This degree of offense (3rd) can incur a prison sentence from one to three years and/or fines not more than $10,000.