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Try a large screwdriver and use it as a lever against the front edge of the hood over the radiator support. May want to put a rag between the hood a screwdriver to avoid scratching. This release lever needs to be pushed down. FYI - when these latches wear out you sometimes need to push the hood back down a half inch while pushing the release lever at the top of the radiator support.
Maybe come in thru the grill with a coat hanger and pull the release lever down rather than trying to wedge anything between the hood and the radiator support.
May not be a size issue, these latches are quite tempermental. Good Luck