There are a few factors to consider before thinking of trying different tips and tricks. But before that, are they proven breeders? I think someone asked and you said they are first time breeders with each other, which doesn't tell us if they are proven or not.
If one or both of them have never had a clutch, them have some patience. One of them may not be ready. I had a Pastel Banana one time that was not interested in any females whatsoever. A few days after his last pairing (and no lock) he went into shed. A week after he shed, he became a breeding machine. Usually it's all about timing.
But if they are proven breeders, still no big deal. Males will usually breed no matter time of the year it is. Females are the ones who have to be in the mood, just like in us humans. She may just not be ready yet. I'd wait a couple weeks and then maybe try again. So as to not add more stress than necessary to either one of them. So let's just say that by chance, next week they are both ready, holding off another week or two to pair isn't going to ruin your season. The whole process is a lengthy one. Give them a couple weeks, feed em, put some weight on them and try again.