Villagers Keep Destroying my Crops (Bedrock 1.14)

My villagers don’t trample my crops but recently, they’ve been trying to harvest them like the crops are their own and it’s extremely annoying because they often replace my crop with a completely different one! I tried to prevent that from happening by putting iron doors in the outsides of all my structures but somehow a few of the learned how to open the doors so the problem continues. I have resorted to killing some of the villagers but I don’t want to have to kill some of my higher level villagers because they have some very useful trades I can take advantage of for my next big projects in that particular survival world. I play on bedrock edition 1.14 on Xbox so the villagers really have better trades. Also, I had expanded my village by adding 20+ small cube buildings in hopes to having more villagers to trade from (which worked but overpopulation has caused many issues such as this one). Now, with having twice the amount of villagers as before, there are also that many more iron golems. What do you guys propose I do? I have had to make multiple modifications already to more than one of my farming facilities. I want to know if any of you can come up with an easier solution than than destroying all the extra buildings I made and killing over half the villagers and fighting the now 6 iron golems.