MYSQL Conditional Always Evaluating to Else - mysql

Question

The below MYSQL conditional from a trigger is always evaluating to the ELSE statement after I have verified the numbers are as expected. If I make the following assumptions: NEW.exit_time = '2019-04-09 11:50:00', OLD.enter_time = '2019-04-09 11:00:00' I expect time_in_minutes = 50, which should then SET NEW.total = 25 if plot_minimum_cost = 25. I have verified that the select statements populating plot_minimum_cost and plot_minute_cost are accurate given that plot_max_cost is functioning correctly and it is using the same logic to retrieve. What am I missing?
DROP TRIGGER IF EXISTS get_total_parking_cost;
DELIMITER $$
CREATE TRIGGER get_total_parking_cost BEFORE UPDATE
ON records
FOR EACH ROW
BEGIN
DECLARE plot_minimum_cost DOUBLE;
DECLARE plot_max_cost DOUBLE;
DECLARE plot_minute_cost DOUBLE;
DECLARE time_in_lot DATETIME;
DECLARE time_in_minutes DOUBLE;
SELECT parking_lots.min_cost INTO plot_minimum_cost
FROM parking_lots
WHERE parking_lots.id = OLD.parking_id;
SELECT parking_lots.max_cost INTO plot_max_cost
FROM parking_lots
WHERE parking_lots.id = OLD.parking_id;
SELECT parking_lots.minutely_cost INTO plot_minute_cost
FROM parking_lots
WHERE parking_lots.id = OLD.parking_id;
SET #time_in_lot = TIMEDIFF(NEW.exit_time, OLD.enter_time);
SET #time_in_minutes = (HOUR(time_in_lot) * 60) + MINUTE(time_in_lot);
IF #time_in_minutes <= 60 THEN
SET NEW.total = plot_minimum_cost;
ELSEIF #time_in_minutes <= 300 THEN
SET NEW.total = time_in_minutes * plot_minute_cost;
ELSE
SET NEW.total = plot_max_cost;
END IF;
END$$
DELIMITER ;

Answer 1

You've declared the local variable time_in_lot and are using it in (HOUR(time_in_lot) * 60) + MINUTE(time_in_lot); but you never actually set it. You set #time_in_lot which is a session variable. Similarly, you are setting #time_in_minutes even though you've declared an time_in_minutes; but in that case you are using the # version for the IF conditions.
Basically, remove all instances of the # character from the trigger and see if that fixes it.