From Ammoland:

The reported incident took place at Jan Kaminis Platt Regional Library in South Tampa. Castor, who was not there to cast a vote, reportedly entered through the exit with a news media crew embedded with her campaign.

Castor violated the 150-foot exclusion zone, which prohibits candidates and campaign officials from campaigning at polling locations and is a violation of the law. Additionally, walking in through the exit is also in itself a violation of Florida election laws.