Compare key and get neatest min key and it’s value in JavaScript array of object

I have JS object like this

{
        "100": {.. data },
        "200": {.. data },
        "500": {.. data },
        "1000": {.. data }
    /* so on */
            
    }

here how to search key with any number like 
if search number is between 0 to 99 then it will return false,
if search number is between 100 to 199 then i t will return key 100 and it's value 
if 500 to 999 then return key 500 and it's value 
if 1000+ then key as 1000 and it's value