Immediate functions not running

Question

I have 3 immediate functions declared inside the handler function of an AWS Lambda:

exports.handler = async (event, context, callback) => { 
    (async doFirstStep => {
        console.log("First Step")
    })

    (async doSecondStep => {
        console.log("Second Step")
    })

    (async doThirdStep => {
        console.log("Third Step")
    })
}

When I run the test, the output is as follows:

// INFO First Step

If I change the order of the functions and put the doSecondStep before the doFirstStep then the output is:

// INFO Second Step

The problem is that only one function is executed, any hint on why the other functions are not working as they should be?