Bracing/Breaching a Held Door

[khorboth]

I don't have books on me, but I did something similar once.

Two characters pushing & shoving on a door trying to get it open/closed. I went with a *regular* contest of ST. I think something similar would work well for you. Unless there's something stopping the guys from battering down the door, they'll get in eventually. Bracing will slow it down considerably. And every roll held some tension.