Replace Brake Lights on 2001 Toyota Sienna

Hi. I’m trying to replace burned out brake lights on a 2001 Toyota Sienna. I bought the lights and the wrench to unscrew the bolts, but I can’t get the light enclosure removed from the car. I’ve watched videos of people using a flat head screwdriver to pull out the module, but I’ve been trying this and can’t get it out. I can pull out the part where the bolts are, but not the other side (pointing to front of the car).

What am I doing wrong here?