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We have one of these for our toddler...works great even on adults!
FYI - The pins that hold the latches in place eventually walk out. I put some tape over them and then make sure they stay in place every few weeks.
There are child proof deadbolt covers too, they slip over the existing deadbolt and dont hamper the deadbolt operation. They are landlord friendly.
Safety 1st Secure Mount Deadbolt Lock [link]
Our daughter recently did something similar. She walked out the front door after opening the deadbolt by herself and walked around to our backyard. I ran out to the garage for a second, and when I came back in I couldn't find her anywhere. She shut the door after herself, so I didn't know she'd gotten out right away. I looked outside into the backyard and called out for her as she's walking around the side saying, "I'm here Mommy, I'm here".
We ordered this a couple days later.
This sort of thing is what /u/dakdaddy22 is talking about. You should be able to find that, or a substantially similar device at Walmart or any home building supplies big box store.
Oh man, my son can unlock the doors too and it was heart attack inducing! We bought these lock covers and just keep the deadbolt engaged all the time when we are inside. They just screw into the doorknob set, no drilling into the actual door
Yeah, they figure these things out way too fast. Just this morning my 3 year said "I'll get my vitamin," and grabbed the big childproof jar of gummy vitamins. I'm thinking this is great, she can fool with it for a minute while I make her breakfast, and I'll open it for her when she gives up. Nope. Childproof cap off in 5 seconds. I think I'll spend tonight doubling up on cabinet locks for the medicines.
On the front door thing:these work really well and I find they're not as annoying for adults.
It's not a lock, but seems to confuse the hell out of your average adult as to how it opens. Especially if they're just reaching in and can't see it. Benefit is that it doesn't use any new screw holes and just slides in around the existing dead bolt.
Would something like this work?
One of these might help