Basic JavaScript - Stand in Line

I have implemented the given problem statement using array methods, I am not getting why it is not being resolved, any help is appreciated.

function nextInLine(arr, item) {
  // Only change code below this line
 let  newArray=arr.push(item);
 let currentElement = newArray.shift();
  return currentElement;
  // Only change code above this line
}

// Setup
let testArr = [1, 2, 3, 4, 5];

// Display code
console.log("Before: " + JSON.stringify(testArr));
console.log(nextInLine(testArr, 6));
console.log("After: " + JSON.stringify(testArr));

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Challenge: Basic JavaScript - Stand in Line

Link to the challenge:

push() doesn’t return an array.

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