CSP blocking javascript onclick function

I have a javascript onclick function which is blocked by CSP. I tried to solve this by using a different syntax but it still is not working. This the new syntax I tried.

<div class="form">
        <div class="title">Welcome</div>
        <div class="subtitle">Open A Door</div>
        <div class="input-container ic1">
             <input id="old_key" class="input" type="text" placeholder="" />
             <div class="cut"></div>
             <div class="cut"></div>
             <label for="firstname" class="placeholder">Enter Your Key</label>
           </div>
        <button type="text" class="submit">Unlock</button>
    </form>
    <script>
    async function othername_2() {
        console.log("Popup Touch Confirmed")
        var input_2 = document.getElementById("old_key").value;
        console.log(input_2);
    }
</script>

How do I access this function ?