I like to use combination locks for our gates for a few reasons. The big one is no key to lose and common codes. Also, if another group/family member needs to access the gates without you being there, a quick call can solve the situation. No key to hide nor to be found....
I also reset the lock to zero-zero-zero-zero after I lock it up. That way is someone has tried a few combinations, chances are the no-gooder won't reset it to my code. While locks only keep honest people out, I try to make my house more difficult than the neighbors. Thieves are lazy like that....
Keep Right On Prepping - K