блокчейн-дверь

pragma solidity >=0.5.0 <0.5.12;
contract SmartDoor{
    uint8 hour;
    uint8 minute;
    uint8 second;
    // True - закрытие двери, False - открытие двери
    bool last_action;
    constructor() public{
        hour = 0;
        minute = 0;
        second = 0;
        last_action = true;
    }
    function closeDoor(uint8 t_hour, uint8 t_minute, uint8 t_second) public{
        require(last_action == false);
        hour = t_hour;
        minute = t_minute;
        second = t_second;

    }
    function openDoor(uint8 t_hour, uint8 t_minute, uint8 t_second) public{
        require(last_action == true);
        hour = t_hour;
        minute = t_minute;
        second = t_second;
    }
    function getStatus() public view returns (uint8, uint8, uint8, bool){
        return (hour, minute, second, last_action);
    }
}