My transmission is stuck in park. I hold down the brake pedal, but it's stuck

When you push the release button next to the shift lever , make sure your not trying to squeeze the button on the shifter handle at the same time. that can prevent it from releasing. If , when stepping on the brake pedal , you do have brake lights , but you don't hear the 'shift lock solenoid' clicking you either have a bad connection (wire or plug) , or there may be a problem with the PCM or 'gear selector switch' (range selector switch). Reply with results or other symptoms for further diagnostic tips.

ck pwr to brake light switch and brake lights the ck pwr to lockout solenoid

You need a new ignition switch. In the short term u can put your key gently in the trans lock next 2 ur shifter. Very common problem 4 honda