I am currently living in Spain and another oddity I noticed is that almost all external doors lock automatically when closed, and require the key to open, even

I am currently living in Spain and another oddity I noticed is that almost all external doors lock automatically when closed, and require the key to open, even from the inside. Always struck me as a bit odd that in an emergency I might be locked inside my own home without an easy egress method. My house (and most others in the area) have bars on all the windows to prevent thieves from entering, but would also prevent me from just jumping out of a window as well. I generally just leave the keys in the door at night, just in case, but it's still always in the back of my mind how unsafe it is.