usually i lock the car with the unlock/lock button on my key right after i shut my door, yesterday i was driving with my sister and when i went to lock my car it went beeeep because i forgot to make sure that my sister closed her door, so after she closed her door, the sound stopped. but after that everytime either door is open, the car makes that beep sound again until the doors are shut. today i went to unlock the car with my key and it didnt unlock, so i opened the door manually and went inside to start the car, the key turns but car doesnt start or crank either