They might be “paranoid” about security and people messing with their devices but funnily enough there is at least one company based in Israel that for a (relatively hefty) fee, will decrypt any apple device in no time.
Now, I am not the one to support conspiracy theories and I don’t want to speculate how this company got the knowledge to do that they offer. I would never imply they are a side operation with access to the internal information from apple. Probably they are just very good at what they do
And if they are, I am sure there are more like them we have not heard about.
So, if the US intelligence agencies want to get into your Iphone, I am sure they can