How can i make text showing up after some period of time?

I am a newbie. i wanted make little text showing under the door after player reaching the door and waiting some time, but text doesn't show up. text part works fine, but " call_later" not.

var _callback = function(){    draw_set_font(v_lol);    draw_set_colour(c_yellow);    draw_text(x, y-30, "press key up");}if place_meeting(x,y,obj_player) = true {     var _handle  = call_later(10,time_source_units_seconds,_callback);}