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My iPhone is frozen on my lock screen and is also zoomed in. I can only open siri which closes after two seconds. I have tried the double tapping with three fingers and this has failed. I cannot attempt to force restart it as my home button is broken so have been forced to use assistive touch. Any help is appreciated

Have you tried clicking more than twice? i find that sometimes you have to click it a lot for it to register something

You open the zoom function, please click on the screen 2 times in a row with three fingers