R129 1998 help keys locked in boot

[dickyf]

hi
i have managed to lock the keys in the boot with the alarm on and the doors locked. i used the key to open the boot remotely but i supect it is deadlocked as the key hole is in the vertical position....
we have managed to get into the car but cannot open the boot.
we have tried a compressor on the vacuum pipes but it only opens the door locks.
any assitance would be greatly appreciated......

thanks