2005 STS Cadillac wont start?

it says push and hold break to start and i did and it wont start. everything was fine before. it has done this in the past and randomly worked again. i put the key fob in the insert in the glove box. the cars theft system does need repair. and prior to this happening i turned my car off in my garage but sat in... show more it says push and hold break to start and i did and it wont start. everything was fine before. it has done this in the past and randomly worked again. i put the key fob in the insert in the glove box. the cars theft system does need repair. and prior to this happening i turned my car off in my garage but sat in it to hear a song on the radio. then 20 min later the car wouldn't start

what could be wrong?
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