I think its because the wrong code has been put in and you have to wait for the screen to clear before imputting the right code, if you keep trying to imput the code it will eithe rfreeze the lock or keep adding time on to it, im no safe expert but i guess thats it,
Leave it for a long delay (could be 12 hours for all we know) and when it clears try it again with the right combo,
If im totally wrong i will be put in my place quite soon im sure, eh guys
Any more info that the address above and this post and it leads to an advanced section topic so if im right ad that doesnt work you need to try the adress above.