All you do on my STARCRAFT Trailer is slide you hand down the velcro upper door flap and reach inside and UNLOCK or LOCK in your case the lower entrance door handle. Takes maybe 10 seconds...
Sometimes when I am carrying in a couple of grocery bags it is easier to slip my hand thru the velcro flap to unlock the door then it is too sit the grocery bags down and fumble around for my key haha...
Roy Ken