I only use the deadbolts. The only time I have ever been locked out my house in the 19 years here was when the in-laws locked the other lock and pulled it shut behind them.Looked at both front and back doors and both have deadbolts. Probably going to lock the deadbolts going forward. Plus side also for doing this is you need to lock a deadbolt from outside so making sure you have your keys is even more important.
Also hiding a spare key outside the house as well.
But now that this has happened to me the OCD in me will have me checking 4 or 5 times that I have them on me before leaving the house.