For the latch I used this one. Cheap and pretty secure. Lowes but I'm sure all hardware stores have them.
This does a good job preventing accidental openings when my "little girl" decides to curl up at my feet with her dainty butt pushing on the door
Beau & Sue
2015 Coachmen Catalina 303RLS
2016 Chevy Silverado LT 2500HD Duramax
The more people I meet, the more I like my dogs!