What causes gear shifter to remain locked after starting car and pressing brake?

What is your question?

After starting car and while pressing brake pedal, I sometimes can not move the gear shift from Park position. I believe the brake pedal switch is OK as the brake lights work ... but the gear shift remains locked. It usually unlocks after I open a door. By-the-way, my interior lights usually remain on for several minutes after I shut car door. Perhaps the two issues are related.