Keys locked in running car.

it may not be a spare key !
some cars have a set of keys
one that unlocks the door but does not start the car
one that may unlock the boot but not the car door

You may have a similar extra key !

another one the does every lock

If you have remote-keys for the car, try beeping the car different times. Try locking it and unlocking it. If not, try starting the car, and if that still doesn't work, try doing anything that will run the battery out

what type of vehicle?

Hello
If the keyholes were not used for some time - then the grease in there could turn into stiff mass. Try put some wd40 in the keyholes and try to turn around with a key - watch out so that the key wouldn't break and stay inside the hole. Good luck

Providing central locking works when you insert key in lock,try programming keys
Enter car make sure all doors/windows are shut
Switch ignition on and off,remove key
PRESS AND HOLD UNLOCK BUTTON ON KEY
Press lock button on key 3 times whithin 10 seconds and release unlock
Central locking will lock/unlock rapidly to confirm reset
If your key is the type with bmw logo in the middle battery replacement is not possible,as it charges as you drive

could be, try installing a new battery on the spare remote and retry,if it still doesnt work, then reprograming will be needed, try the battery first and let me know what happens.

sounds like send/recieve signall out of sync.try locking car with key.hold lock button down on key for 30 secs.then unlock button for 30 secs.(point key at car from about 6 foot.)you do not need to sync all keys to car.hope this works.did for me.

Try reversing the process with your other keys. You may just have a low battery in the key you unlocked with. Security settings on teh vehicle are programmable by the dealership. When my battery has failed under teh hood and we unlocked the car to boost, the horn went off the same way. Once the battery was replaced everything functioned fine. Your battery in the key may be failing to communicate with the car,or security was programmed that way from last owner, but try the procedure with and without spare keys locked inside

you will have to call a profesional locksmith who can make you a key for the door only to unlock it, i do auto lockouts for a living but we are unable to unlock them with standard tools for unlocking cars, I can pump open the door and hit the unlock switch but it will never unlock the door, the car alarm prevents this from doing so. Slim jims dont work on these also, nothing works, BMW actaullay requires us to tow them to the dealership whenever we get lockouts for BMW's. give the dealership your VIN number and they can send you another key for about $150, if you ca afford a BMW then u can afford $150 to get a new key.

I locked the 2000 lincoln continental with the key fob but lost it now the ignition key wilolo not unlock the door