“I try to keep the house locked at all times, but the noise of the shower covers up most external sounds.”
I try to keep a reasonable perspective on these things. How many times has your house been broken into? How many times has your neighbors homes been broken into? If the answer is not many, I dont worry about arming myself for the 15 minutes a day I’m in the shower. If the answer is “all the time”, I’d get an alarm, a big dog, or better yet, I’d move to a better neighborhood.