The incident happened Wednesday, WKMG-TV, Orlando, reported.
Police said a salesman helped the suspect get into a white 2009 Pontiac G6 so they could go for a test drive. Once inside the car, however, the suspect locked the doors, started the car and pressed the gas pedal with his folding cane, police said.
He then left the dealership with police soon in pursuit.
The suspect was arrested a short while later by Alachua County Sheriff's deputies.
Police said the suspect may be charged with grand theft auto.