Car won't go into gear

Please help.... I just drove to work and as soon as I got here I needed to leave again. So when I get into the car and try and take it out of park the shifter will not go into gear. It is just stuck in park. My transmission is automatic and I had my foot on the brake. THis is the first time I have ever had this problem.

Does anyone know a solution to this or why it is doing it at all? Please help me. I dont want to be stuck at work all day long.