currkey=0;
% do not move on until enter key is pressed
while currkey~=1
    pause; % wait for a keypress
    currkey=get(gcf,'CurrentKey');
    if strcmp(currkey, 'return') % You also want to use strcmp here.
        currkey=1 % Error was here; the "==" should be "="
    else
        currkey=0 % Error was here; the "==" should be "="
    end
end