Listen, from time to time I too have forgotten my keys and have been locked out. However, making this a weekly occurrence is not good roommate etiquette and is bothersome for both you and myself.
Also, not locking the door when you leave and I am not home either is not appreciated. I have things that cost money and do not have the money to buy renter's insurance just because you are too lazy to lock the door and carry a key. Just lock the door and hide the key somewhere, it is better than nothing.—Roommate with shit people would steal