I "unwittingly" locked my keys in my car the other day (the car only came with iginition key and I only have money to get a single door key)
My drivers door lock tumbler wasn't working so I was used to locking from the back door and whatnot.
The locksmith showed up (friend has AAA+!) and it took him about 12 seconds to open my car...
Quick...painless...and it hurts absolutely nothing...really old guy...very skilled..

Maybe you slammed the door so hard that the vac pump has started complaining of the abuse back there in the trunk in its little foamy/rubber home?
Hehe