Is it essential to highlight the use of a metaphor with 像...那样 or something to this effect?
如果别人不想接电话，不用像一个审问那样问他 


一个审问 (an interrogation) is a noun, but your sentence suggests 审问 is a verb with the object "犯人" omitted

The problem of your sentence is 像(审问)犯人那样(问)他 is an incorrect form of shorten "审问"

The correct form is 如果别人不想接电话，不用像(审问)犯人那样(审)他 (if someone doesn't want to take your phone call, there's no need to interrogate him like interrogate a criminal suspect)

You can reduce "像(审问犯人)那样" to "像(审犯)那样" . 审犯 (interrogate criminal suspect) is a common Chinese term 

You can even shorten the sentence further by removing "如果" and "像... 那样" and write: "别人不想接电话，也不用(审犯)般(审)他" 

也 implies 如果; 般 means 那样