@talentryto- I'm glad you found this information out before you have young visitors in your kitchen. I think you will find that the first type of oven lock described in the article, the one that is similar to a latch, is very easy to use.
I have used these types of oven locks before, and I like the fact that the attachment for the latch goes on the top of the oven. This feature makes it hard for little ones to reach. These oven locks are also very affordable and easy to find in most retail and appliance stores.